This page displayes MARC21 structure in formatted JSON format. It is generated from the Java classes which describe the structure. The structure follows Avram JSON schema which was created by Jakob Voß in order to create a common ground for both MARC21, PICA and metadata standards. There are some more attributes which is not exported into the JSON format because it is specific only for MARC and is not available elsewhere, but both this export and Avram is a work in progress. If you miss something, please let me know via the issue tracker. Credits: the JSON schema was originally requested by Jakob Voß and Johann Rolschewski, Avram - as far as I understand - grown from this discussion.

A raw version is avalable here.

To generate the file from the program:

./common-script
java -cp $JAR de.gwdg.metadataqa.marc.cli.MappingToJson > marc-schema.json

or

java -cp target/metadata-qa-marc-0.2-SNAPSHOT-jar-with-dependencies.jar de.gwdg.metadataqa.marc.cli.MappingToJson > marc-schema.json

Note: Jakob Voß published Avram specification after the publication of the original version of this post. The content the JSON format was chanced, and the current version valid against Avram.

{
  "$schema": "https://format.gbv.de/schema/avram/schema.json",
  "title": "MARC 21 Format for Bibliographic Data.",
  "description": "MARC 21 Format for Bibliographic Data.",
  "url": "https://www.loc.gov/marc/bibliographic/",
  "fields": {
    "LDR": {
      "repeatable": false,
      "positions": {
        "00-04": {
          "label": "Record length",
          "url": "https://www.loc.gov/marc/bibliographic/bdleader.html"
        },
        "05": {
          "label": "Record status",
          "url": "https://www.loc.gov/marc/bibliographic/bdleader.html",
          "codes": {
            "a": {
              "label": "Increase in encoding level"
            },
            "c": {
              "label": "Corrected or revised"
            },
            "d": {
              "label": "Deleted"
            },
            "n": {
              "label": "New"
            },
            "p": {
              "label": "Increase in encoding level from prepublication"
            }
          }
        },
        "06": {
          "label": "Type of record",
          "url": "https://www.loc.gov/marc/bibliographic/bdleader.html",
          "codes": {
            "a": {
              "label": "Language material"
            },
            "c": {
              "label": "Notated music"
            },
            "d": {
              "label": "Manuscript notated music"
            },
            "e": {
              "label": "Cartographic material"
            },
            "f": {
              "label": "Manuscript cartographic material"
            },
            "g": {
              "label": "Projected medium"
            },
            "i": {
              "label": "Nonmusical sound recording"
            },
            "j": {
              "label": "Musical sound recording"
            },
            "k": {
              "label": "Two-dimensional nonprojectable graphic"
            },
            "m": {
              "label": "Computer file"
            },
            "o": {
              "label": "Kit"
            },
            "p": {
              "label": "Mixed materials"
            },
            "r": {
              "label": "Three-dimensional artifact or naturally occurring object"
            },
            "t": {
              "label": "Manuscript language material"
            }
          },
          "historical-codes": {
            "b": {
              "label": "Archival and manuscripts control [OBSOLETE, 1995]"
            },
            "h": {
              "label": "Microform publications [OBSOLETE, 1972] [USMARC only]"
            },
            "n": {
              "label": "Special instructional material"
            }
          }
        },
        "07": {
          "label": "Bibliographic level",
          "url": "https://www.loc.gov/marc/bibliographic/bdleader.html",
          "codes": {
            "a": {
              "label": "Monographic component part"
            },
            "b": {
              "label": "Serial component part"
            },
            "c": {
              "label": "Collection"
            },
            "d": {
              "label": "Subunit"
            },
            "i": {
              "label": "Integrating resource"
            },
            "m": {
              "label": "Monograph/Item"
            },
            "s": {
              "label": "Serial"
            }
          },
          "historical-codes": {
            "p": {
              "label": "Pamphlet [OBSOLETE, 1988] [CAN/MARC only]"
            }
          }
        },
        "08": {
          "label": "Type of control",
          "url": "https://www.loc.gov/marc/bibliographic/bdleader.html",
          "codes": {
            " ": {
              "label": "No specified type"
            },
            "a": {
              "label": "Archival"
            }
          }
        },
        "09": {
          "label": "Character coding scheme",
          "url": "https://www.loc.gov/marc/bibliographic/bdleader.html",
          "codes": {
            " ": {
              "label": "MARC-8"
            },
            "a": {
              "label": "UCS/Unicode"
            }
          }
        },
        "10": {
          "label": "Indicator count",
          "url": "https://www.loc.gov/marc/bibliographic/bdleader.html"
        },
        "11": {
          "label": "Subfield code count",
          "url": "https://www.loc.gov/marc/bibliographic/bdleader.html"
        },
        "12-16": {
          "label": "Base address of data",
          "url": "https://www.loc.gov/marc/bibliographic/bdleader.html"
        },
        "17": {
          "label": "Encoding level",
          "url": "https://www.loc.gov/marc/bibliographic/bdleader.html",
          "codes": {
            " ": {
              "label": "Full level"
            },
            "1": {
              "label": "Full level, material not examined"
            },
            "2": {
              "label": "Less-than-full level, material not examined"
            },
            "3": {
              "label": "Abbreviated level"
            },
            "4": {
              "label": "Core level"
            },
            "5": {
              "label": "Partial (preliminary) level"
            },
            "7": {
              "label": "Minimal level"
            },
            "8": {
              "label": "Prepublication level"
            },
            "u": {
              "label": "Unknown"
            },
            "z": {
              "label": "Not applicable"
            }
          },
          "historical-codes": {
            "0": {
              "label": "Full level with item [OBSOLETE, 1997] [CAN/MARC only]"
            },
            "6": {
              "label": "Minimal level [OBSOLETE, 1997] [CAN/MARC only]"
            }
          }
        },
        "18": {
          "label": "Descriptive cataloging form",
          "url": "https://www.loc.gov/marc/bibliographic/bdleader.html",
          "codes": {
            " ": {
              "label": "Non-ISBD"
            },
            "a": {
              "label": "AACR 2"
            },
            "c": {
              "label": "ISBD punctuation omitted"
            },
            "i": {
              "label": "ISBD punctuation included"
            },
            "n": {
              "label": "Non-ISBD punctuation omitted"
            },
            "u": {
              "label": "Unknown"
            }
          },
          "historical-codes": {
            "p": {
              "label": "Record is in partial ISBD form [OBSOLETE, 1987]"
            },
            "r": {
              "label": "Record is in provisional form [OBSOLETE, 1981]"
            }
          }
        },
        "19": {
          "label": "Multipart resource record level",
          "url": "https://www.loc.gov/marc/bibliographic/bdleader.html",
          "codes": {
            " ": {
              "label": "Not specified or not applicable"
            },
            "a": {
              "label": "Set"
            },
            "b": {
              "label": "Part with independent title"
            },
            "c": {
              "label": "Part with dependent title"
            }
          },
          "historical-codes": {
            "r": {
              "label": "Linked record requirement [OBSOLETE, 2007]"
            },
            "2": {
              "label": "Open entry for a collection [OBSOLETE, 1984] [CAN/MARC only]"
            }
          }
        },
        "20": {
          "label": "Length of the length-of-field portion",
          "url": "https://www.loc.gov/marc/bibliographic/bdleader.html"
        },
        "21": {
          "label": "Length of the starting-character-position portion",
          "url": "https://www.loc.gov/marc/bibliographic/bdleader.html"
        },
        "22": {
          "label": "Length of the implementation-defined portion",
          "url": "https://www.loc.gov/marc/bibliographic/bdleader.html"
        }
      }
    },
    "001": {
      "tag": "001",
      "label": "Control Number",
      "repeatable": false
    },
    "003": {
      "tag": "003",
      "label": "Control Number Identifier",
      "repeatable": false
    },
    "005": {
      "tag": "005",
      "label": "Date and Time of Latest Transaction",
      "repeatable": false
    },
    "006": {
      "tag": "006",
      "label": "Additional Material Characteristics",
      "repeatable": true,
      "types": {
        "All Materials": {
          "positions": {
            "00": {
              "label": "Form of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                "a": {
                  "label": "Language material"
                },
                "c": {
                  "label": "Notated music"
                },
                "d": {
                  "label": "Manuscript notated music"
                },
                "e": {
                  "label": "Cartographic material"
                },
                "f": {
                  "label": "Manuscript cartographic material"
                },
                "g": {
                  "label": "Projected medium"
                },
                "i": {
                  "label": "Nonmusical sound recording"
                },
                "j": {
                  "label": "Musical sound recording"
                },
                "k": {
                  "label": "Two-dimensional nonprojectable graphic"
                },
                "m": {
                  "label": "Computer file"
                },
                "o": {
                  "label": "Kit"
                },
                "p": {
                  "label": "Mixed materials"
                },
                "r": {
                  "label": "Three-dimensional artifact or naturally occurring object"
                },
                "s": {
                  "label": "Serial/Integrating resource"
                },
                "t": {
                  "label": "Manuscript language material"
                }
              }
            }
          }
        },
        "Books": {
          "positions": {
            "01-04": {
              "label": "Illustrations",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "No illustrations"
                },
                "a": {
                  "label": "Illustrations"
                },
                "b": {
                  "label": "Maps"
                },
                "c": {
                  "label": "Portraits"
                },
                "d": {
                  "label": "Charts"
                },
                "e": {
                  "label": "Plans"
                },
                "f": {
                  "label": "Plates"
                },
                "g": {
                  "label": "Music"
                },
                "h": {
                  "label": "Facsimiles"
                },
                "i": {
                  "label": "Coats of arms"
                },
                "j": {
                  "label": "Genealogical tables"
                },
                "k": {
                  "label": "Forms"
                },
                "l": {
                  "label": "Samples"
                },
                "m": {
                  "label": "Phonodisc, phonowire, etc."
                },
                "o": {
                  "label": "Photographs"
                },
                "p": {
                  "label": "Illuminations"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "05": {
              "label": "Target audience",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "Unknown or not specified"
                },
                "a": {
                  "label": "Preschool"
                },
                "b": {
                  "label": "Primary"
                },
                "c": {
                  "label": "Pre-adolescent"
                },
                "d": {
                  "label": "Adolescent"
                },
                "e": {
                  "label": "Adult"
                },
                "f": {
                  "label": "Specialized"
                },
                "g": {
                  "label": "General"
                },
                "j": {
                  "label": "Juvenile"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "06": {
              "label": "Form of item",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "None of the following"
                },
                "a": {
                  "label": "Microfilm"
                },
                "b": {
                  "label": "Microfiche"
                },
                "c": {
                  "label": "Microopaque"
                },
                "d": {
                  "label": "Large print"
                },
                "f": {
                  "label": "Braille"
                },
                "o": {
                  "label": "Online"
                },
                "q": {
                  "label": "Direct electronic"
                },
                "r": {
                  "label": "Regular print reproduction"
                },
                "s": {
                  "label": "Electronic"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "07-10": {
              "label": "Nature of contents",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "No specified nature of contents"
                },
                "a": {
                  "label": "Abstracts/summaries"
                },
                "b": {
                  "label": "Bibliographies"
                },
                "c": {
                  "label": "Catalogs"
                },
                "d": {
                  "label": "Dictionaries"
                },
                "e": {
                  "label": "Encyclopedias"
                },
                "f": {
                  "label": "Handbooks"
                },
                "g": {
                  "label": "Legal articles"
                },
                "i": {
                  "label": "Indexes"
                },
                "j": {
                  "label": "Patent document"
                },
                "k": {
                  "label": "Discographies"
                },
                "l": {
                  "label": "Legislation"
                },
                "m": {
                  "label": "Theses"
                },
                "n": {
                  "label": "Surveys of literature in a subject area"
                },
                "o": {
                  "label": "Reviews"
                },
                "p": {
                  "label": "Programmed texts"
                },
                "q": {
                  "label": "Filmographies"
                },
                "r": {
                  "label": "Directories"
                },
                "s": {
                  "label": "Statistics"
                },
                "t": {
                  "label": "Technical reports"
                },
                "u": {
                  "label": "Standards/specifications"
                },
                "v": {
                  "label": "Legal cases and case notes"
                },
                "w": {
                  "label": "Law reports and digests"
                },
                "y": {
                  "label": "Yearbooks"
                },
                "z": {
                  "label": "Treaties"
                },
                "2": {
                  "label": "Offprints"
                },
                "5": {
                  "label": "Calendars"
                },
                "6": {
                  "label": "Comics/graphic novels"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "11": {
              "label": "Government publication",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "Not a government publication"
                },
                "a": {
                  "label": "Autonomous or semi-autonomous component"
                },
                "c": {
                  "label": "Multilocal"
                },
                "f": {
                  "label": "Federal/national"
                },
                "i": {
                  "label": "International intergovernmental"
                },
                "l": {
                  "label": "Local"
                },
                "m": {
                  "label": "Multistate"
                },
                "o": {
                  "label": "Government publication-level undetermined"
                },
                "s": {
                  "label": "State, provincial, territorial, dependent, etc."
                },
                "u": {
                  "label": "Unknown if item is government publication"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "12": {
              "label": "Conference publication",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                "0": {
                  "label": "Not a conference publication"
                },
                "1": {
                  "label": "Conference publication"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "13": {
              "label": "Festschrift",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                "0": {
                  "label": "Not a festschrift"
                },
                "1": {
                  "label": "Festschrift"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "14": {
              "label": "Index",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                "0": {
                  "label": "No index"
                },
                "1": {
                  "label": "Index present"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "16": {
              "label": "Literary form",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                "0": {
                  "label": "Not fiction (not further specified)"
                },
                "1": {
                  "label": "Fiction (not further specified)"
                },
                "d": {
                  "label": "Dramas"
                },
                "e": {
                  "label": "Essays"
                },
                "f": {
                  "label": "Novels"
                },
                "h": {
                  "label": "Humor, satires, etc."
                },
                "i": {
                  "label": "Letters"
                },
                "j": {
                  "label": "Short stories"
                },
                "m": {
                  "label": "Mixed forms"
                },
                "p": {
                  "label": "Poetry"
                },
                "s": {
                  "label": "Speeches"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "17": {
              "label": "Biography",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "No biographical material"
                },
                "a": {
                  "label": "Autobiography"
                },
                "b": {
                  "label": "Individual biography"
                },
                "c": {
                  "label": "Collective biography"
                },
                "d": {
                  "label": "Contains biographical information"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Continuing Resources": {
          "positions": {
            "01": {
              "label": "Frequency",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "No determinable frequency"
                },
                "a": {
                  "label": "Annual"
                },
                "b": {
                  "label": "Bimonthly"
                },
                "c": {
                  "label": "Semiweekly"
                },
                "d": {
                  "label": "Daily"
                },
                "e": {
                  "label": "Biweekly"
                },
                "f": {
                  "label": "Semiannual"
                },
                "g": {
                  "label": "Biennial"
                },
                "h": {
                  "label": "Triennial"
                },
                "i": {
                  "label": "Three times a week"
                },
                "j": {
                  "label": "Three times a month"
                },
                "k": {
                  "label": "Continuously updated"
                },
                "m": {
                  "label": "Monthly"
                },
                "q": {
                  "label": "Quarterly"
                },
                "s": {
                  "label": "Semimonthly"
                },
                "t": {
                  "label": "Three times a year"
                },
                "u": {
                  "label": "Unknown"
                },
                "w": {
                  "label": "Weekly"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "02": {
              "label": "Regularity",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                "n": {
                  "label": "Normalized irregular"
                },
                "r": {
                  "label": "Regular"
                },
                "u": {
                  "label": "Unknown"
                },
                "x": {
                  "label": "Completely irregular"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "04": {
              "label": "Type of continuing resource",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "None of the following"
                },
                "d": {
                  "label": "Updating database"
                },
                "l": {
                  "label": "Updating loose-leaf"
                },
                "m": {
                  "label": "Monographic series"
                },
                "n": {
                  "label": "Newspaper"
                },
                "p": {
                  "label": "Periodical"
                },
                "w": {
                  "label": "Updating Web site"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "05": {
              "label": "Form of original item",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "None of the following"
                },
                "a": {
                  "label": "Microfilm"
                },
                "b": {
                  "label": "Microfiche"
                },
                "c": {
                  "label": "Microopaque"
                },
                "d": {
                  "label": "Large print"
                },
                "e": {
                  "label": "Newspaper format"
                },
                "f": {
                  "label": "Braille"
                },
                "o": {
                  "label": "Online"
                },
                "q": {
                  "label": "Direct electronic"
                },
                "s": {
                  "label": "Electronic"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "06": {
              "label": "Form of item",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "None of the following"
                },
                "a": {
                  "label": "Microfilm"
                },
                "b": {
                  "label": "Microfiche"
                },
                "c": {
                  "label": "Microopaque"
                },
                "d": {
                  "label": "Large print"
                },
                "f": {
                  "label": "Braille"
                },
                "o": {
                  "label": "Online"
                },
                "q": {
                  "label": "Direct electronic"
                },
                "r": {
                  "label": "Regular print reproduction"
                },
                "s": {
                  "label": "Electronic"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "07": {
              "label": "Nature of entire work",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "Not specified"
                },
                "a": {
                  "label": "Abstracts/summaries"
                },
                "b": {
                  "label": "Bibliographies"
                },
                "c": {
                  "label": "Catalogs"
                },
                "d": {
                  "label": "Dictionaries"
                },
                "e": {
                  "label": "Encyclopedias"
                },
                "f": {
                  "label": "Handbooks"
                },
                "g": {
                  "label": "Legal articles"
                },
                "h": {
                  "label": "Biography"
                },
                "i": {
                  "label": "Indexes"
                },
                "k": {
                  "label": "Discographies"
                },
                "l": {
                  "label": "Legislation"
                },
                "m": {
                  "label": "Theses"
                },
                "n": {
                  "label": "Surveys of literature in a subject area"
                },
                "o": {
                  "label": "Reviews"
                },
                "p": {
                  "label": "Programmed texts"
                },
                "q": {
                  "label": "Filmographies"
                },
                "r": {
                  "label": "Directories"
                },
                "s": {
                  "label": "Statistics"
                },
                "t": {
                  "label": "Technical reports"
                },
                "u": {
                  "label": "Standards/specifications"
                },
                "v": {
                  "label": "Legal cases and case notes"
                },
                "w": {
                  "label": "Law reports and digests"
                },
                "y": {
                  "label": "Yearbooks"
                },
                "z": {
                  "label": "Treaties"
                },
                "5": {
                  "label": "Calendars"
                },
                "6": {
                  "label": "Comics/graphic novels"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "08-10": {
              "label": "Nature of contents",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "Not specified"
                },
                "a": {
                  "label": "Abstracts/summaries"
                },
                "b": {
                  "label": "Bibliographies"
                },
                "c": {
                  "label": "Catalogs"
                },
                "d": {
                  "label": "Dictionaries"
                },
                "e": {
                  "label": "Encyclopedias"
                },
                "f": {
                  "label": "Handbooks"
                },
                "g": {
                  "label": "Legal articles"
                },
                "h": {
                  "label": "Biography"
                },
                "i": {
                  "label": "Indexes"
                },
                "k": {
                  "label": "Discographies"
                },
                "l": {
                  "label": "Legislation"
                },
                "m": {
                  "label": "Theses"
                },
                "n": {
                  "label": "Surveys of literature in a subject area"
                },
                "o": {
                  "label": "Reviews"
                },
                "p": {
                  "label": "Programmed texts"
                },
                "q": {
                  "label": "Filmographies"
                },
                "r": {
                  "label": "Directories"
                },
                "s": {
                  "label": "Statistics"
                },
                "t": {
                  "label": "Technical reports"
                },
                "u": {
                  "label": "Standards/specifications"
                },
                "v": {
                  "label": "Legal cases and case notes"
                },
                "w": {
                  "label": "Law reports and digests"
                },
                "y": {
                  "label": "Yearbooks"
                },
                "z": {
                  "label": "Treaties"
                },
                "5": {
                  "label": "Calendars"
                },
                "6": {
                  "label": "Comics/graphic novels"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "11": {
              "label": "Government publication",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "Not a government publication"
                },
                "a": {
                  "label": "Autonomous or semi-autonomous component"
                },
                "c": {
                  "label": "Multilocal"
                },
                "f": {
                  "label": "Federal/national"
                },
                "i": {
                  "label": "International intergovernmental"
                },
                "l": {
                  "label": "Local"
                },
                "m": {
                  "label": "Multistate"
                },
                "o": {
                  "label": "Government publication-level undetermined"
                },
                "s": {
                  "label": "State, provincial, territorial, dependent, etc."
                },
                "u": {
                  "label": "Unknown if item is government publication"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "12": {
              "label": "Conference publication",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                "0": {
                  "label": "Not a conference publication"
                },
                "1": {
                  "label": "Conference publication"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "16": {
              "label": "Original alphabet or script of title",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "No alphabet or script given/No key title"
                },
                "a": {
                  "label": "Basic Roman"
                },
                "b": {
                  "label": "Extended Roman"
                },
                "c": {
                  "label": "Cyrillic"
                },
                "d": {
                  "label": "Japanese"
                },
                "e": {
                  "label": "Chinese"
                },
                "f": {
                  "label": "Arabic"
                },
                "g": {
                  "label": "Greek"
                },
                "h": {
                  "label": "Hebrew"
                },
                "i": {
                  "label": "Thai"
                },
                "j": {
                  "label": "Devanagari"
                },
                "k": {
                  "label": "Korean"
                },
                "l": {
                  "label": "Tamil"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "17": {
              "label": "Entry convention",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                "0": {
                  "label": "Successive entry"
                },
                "1": {
                  "label": "Latest entry"
                },
                "2": {
                  "label": "Integrated entry"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Music": {
          "positions": {
            "01-02": {
              "label": "Form of composition",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                "an": {
                  "label": "Anthems"
                },
                "bd": {
                  "label": "Ballads"
                },
                "bg": {
                  "label": "Bluegrass music"
                },
                "bl": {
                  "label": "Blues"
                },
                "bt": {
                  "label": "Ballets"
                },
                "ca": {
                  "label": "Chaconnes"
                },
                "cb": {
                  "label": "Chants, Other religions"
                },
                "cc": {
                  "label": "Chant, Christian"
                },
                "cg": {
                  "label": "Concerti grossi"
                },
                "ch": {
                  "label": "Chorales"
                },
                "cl": {
                  "label": "Chorale preludes"
                },
                "cn": {
                  "label": "Canons and rounds"
                },
                "co": {
                  "label": "Concertos"
                },
                "cp": {
                  "label": "Chansons, polyphonic"
                },
                "cr": {
                  "label": "Carols"
                },
                "cs": {
                  "label": "Chance compositions"
                },
                "ct": {
                  "label": "Cantatas"
                },
                "cy": {
                  "label": "Country music"
                },
                "cz": {
                  "label": "Canzonas"
                },
                "df": {
                  "label": "Dance forms"
                },
                "dv": {
                  "label": "Divertimentos, serenades, cassations, divertissements, and notturni"
                },
                "fg": {
                  "label": "Fugues"
                },
                "fl": {
                  "label": "Flamenco"
                },
                "fm": {
                  "label": "Folk music"
                },
                "ft": {
                  "label": "Fantasias"
                },
                "gm": {
                  "label": "Gospel music"
                },
                "hy": {
                  "label": "Hymns"
                },
                "jz": {
                  "label": "Jazz"
                },
                "mc": {
                  "label": "Musical revues and comedies"
                },
                "md": {
                  "label": "Madrigals"
                },
                "mi": {
                  "label": "Minuets"
                },
                "mo": {
                  "label": "Motets"
                },
                "mp": {
                  "label": "Motion picture music"
                },
                "mr": {
                  "label": "Marches"
                },
                "ms": {
                  "label": "Masses"
                },
                "mu": {
                  "label": "Multiple forms"
                },
                "mz": {
                  "label": "Mazurkas"
                },
                "nc": {
                  "label": "Nocturnes"
                },
                "nn": {
                  "label": "Not applicable"
                },
                "op": {
                  "label": "Operas"
                },
                "or": {
                  "label": "Oratorios"
                },
                "ov": {
                  "label": "Overtures"
                },
                "pg": {
                  "label": "Program music"
                },
                "pm": {
                  "label": "Passion music"
                },
                "po": {
                  "label": "Polonaises"
                },
                "pp": {
                  "label": "Popular music"
                },
                "pr": {
                  "label": "Preludes"
                },
                "ps": {
                  "label": "Passacaglias"
                },
                "pt": {
                  "label": "Part-songs"
                },
                "pv": {
                  "label": "Pavans"
                },
                "rc": {
                  "label": "Rock music"
                },
                "rd": {
                  "label": "Rondos"
                },
                "rg": {
                  "label": "Ragtime music"
                },
                "ri": {
                  "label": "Ricercars"
                },
                "rp": {
                  "label": "Rhapsodies"
                },
                "rq": {
                  "label": "Requiems"
                },
                "sd": {
                  "label": "Square dance music"
                },
                "sg": {
                  "label": "Songs"
                },
                "sn": {
                  "label": "Sonatas"
                },
                "sp": {
                  "label": "Symphonic poems"
                },
                "st": {
                  "label": "Studies and exercises"
                },
                "su": {
                  "label": "Suites"
                },
                "sy": {
                  "label": "Symphonies"
                },
                "tc": {
                  "label": "Toccatas"
                },
                "tl": {
                  "label": "Teatro lirico"
                },
                "ts": {
                  "label": "Trio-sonatas"
                },
                "uu": {
                  "label": "Unknown"
                },
                "vi": {
                  "label": "Villancicos"
                },
                "vr": {
                  "label": "Variations"
                },
                "wz": {
                  "label": "Waltzes"
                },
                "za": {
                  "label": "Zarzuelas"
                },
                "zz": {
                  "label": "Other"
                },
                "||": {
                  "label": "No attempt to code"
                }
              }
            },
            "03": {
              "label": "Format of music",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                "a": {
                  "label": "Full score"
                },
                "b": {
                  "label": "Miniature or study score"
                },
                "c": {
                  "label": "Accompaniment reduced for keyboard"
                },
                "d": {
                  "label": "Voice score with accompaniment omitted"
                },
                "e": {
                  "label": "Condensed score or piano-conductor score"
                },
                "g": {
                  "label": "Close score"
                },
                "h": {
                  "label": "Chorus score"
                },
                "i": {
                  "label": "Condensed score"
                },
                "j": {
                  "label": "Performer-conductor part"
                },
                "k": {
                  "label": "Vocal score"
                },
                "l": {
                  "label": "Score"
                },
                "m": {
                  "label": "Multiple score formats"
                },
                "n": {
                  "label": "Not applicable"
                },
                "p": {
                  "label": "Piano score"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "04": {
              "label": "Music parts",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "No parts in hand or not specified"
                },
                "d": {
                  "label": "Instrumental and vocal parts"
                },
                "e": {
                  "label": "Instrumental parts"
                },
                "f": {
                  "label": "Vocal parts"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "05": {
              "label": "Target audience",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "Unknown or unspecified"
                },
                "a": {
                  "label": "Preschool"
                },
                "b": {
                  "label": "Primary"
                },
                "c": {
                  "label": "Pre-adolescent"
                },
                "d": {
                  "label": "Adolescent"
                },
                "e": {
                  "label": "Adult"
                },
                "f": {
                  "label": "Specialized"
                },
                "g": {
                  "label": "General"
                },
                "j": {
                  "label": "Juvenile"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "06": {
              "label": "Form of item",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "None of the following"
                },
                "a": {
                  "label": "Microfilm"
                },
                "b": {
                  "label": "Microfiche"
                },
                "c": {
                  "label": "Microopaque"
                },
                "d": {
                  "label": "Large print"
                },
                "f": {
                  "label": "Braille"
                },
                "o": {
                  "label": "Online"
                },
                "q": {
                  "label": "Direct electronic"
                },
                "r": {
                  "label": "Regular print reproduction"
                },
                "s": {
                  "label": "Electronic"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "07-12": {
              "label": "Accompanying matter",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "No accompanying matter"
                },
                "a": {
                  "label": "Discography"
                },
                "b": {
                  "label": "Bibliography"
                },
                "c": {
                  "label": "Thematic index"
                },
                "d": {
                  "label": "Libretto or text"
                },
                "e": {
                  "label": "Biography of composer or author"
                },
                "f": {
                  "label": "Biography of performer or history of ensemble"
                },
                "g": {
                  "label": "Technical and/or historical information on instruments"
                },
                "h": {
                  "label": "Technical information on music"
                },
                "i": {
                  "label": "Historical information"
                },
                "k": {
                  "label": "Ethnological information"
                },
                "r": {
                  "label": "Instructional materials"
                },
                "s": {
                  "label": "Music"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "13-14": {
              "label": "Literary text for sound recordings",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "Item is a music sound recording"
                },
                "a": {
                  "label": "Autobiography"
                },
                "b": {
                  "label": "Biography"
                },
                "c": {
                  "label": "Conference proceedings"
                },
                "d": {
                  "label": "Drama"
                },
                "e": {
                  "label": "Essays"
                },
                "f": {
                  "label": "Fiction"
                },
                "g": {
                  "label": "Reporting"
                },
                "h": {
                  "label": "History"
                },
                "i": {
                  "label": "Instruction"
                },
                "j": {
                  "label": "Language instruction"
                },
                "k": {
                  "label": "Comedy"
                },
                "l": {
                  "label": "Lectures, speeches"
                },
                "m": {
                  "label": "Memoirs"
                },
                "n": {
                  "label": "Not applicable"
                },
                "o": {
                  "label": "Folktales"
                },
                "p": {
                  "label": "Poetry"
                },
                "r": {
                  "label": "Rehearsals"
                },
                "s": {
                  "label": "Sounds"
                },
                "t": {
                  "label": "Interviews"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "16": {
              "label": "Transposition and arrangement",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "Not arrangement or transposition or not specified"
                },
                "a": {
                  "label": "Transposition"
                },
                "b": {
                  "label": "Arrangement"
                },
                "c": {
                  "label": "Both transposed and arranged"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Maps": {
          "positions": {
            "01-04": {
              "label": "Relief",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "No relief shown"
                },
                "a": {
                  "label": "Contours"
                },
                "b": {
                  "label": "Shading"
                },
                "c": {
                  "label": "Gradient and bathymetric tints"
                },
                "d": {
                  "label": "Hachures"
                },
                "e": {
                  "label": "Bathymetry/soundings"
                },
                "f": {
                  "label": "Form lines"
                },
                "g": {
                  "label": "Spot heights"
                },
                "i": {
                  "label": "Pictorially"
                },
                "j": {
                  "label": "Land forms"
                },
                "k": {
                  "label": "Bathymetry/isolines"
                },
                "m": {
                  "label": "Rock drawings"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "05-06": {
              "label": "Projection",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                "  ": {
                  "label": "Projection not specified"
                },
                "aa": {
                  "label": "Aitoff"
                },
                "ab": {
                  "label": "Gnomic"
                },
                "ac": {
                  "label": "Lambert's azimuthal equal area"
                },
                "ad": {
                  "label": "Orthographic"
                },
                "ae": {
                  "label": "Azimuthal equidistant"
                },
                "af": {
                  "label": "Stereographic"
                },
                "ag": {
                  "label": "General vertical near-sided"
                },
                "am": {
                  "label": "Modified stereographic for Alaska"
                },
                "an": {
                  "label": "Chamberlin trimetric"
                },
                "ap": {
                  "label": "Polar stereographic"
                },
                "au": {
                  "label": "Azimuthal, specific type unknown"
                },
                "az": {
                  "label": "Azimuthal, other"
                },
                "ba": {
                  "label": "Gall"
                },
                "bb": {
                  "label": "Goode's homolographic"
                },
                "bc": {
                  "label": "Lambert's cylindrical equal area"
                },
                "bd": {
                  "label": "Mercator"
                },
                "be": {
                  "label": "Miller"
                },
                "bf": {
                  "label": "Mollweide"
                },
                "bg": {
                  "label": "Sinusoidal"
                },
                "bh": {
                  "label": "Transverse Mercator"
                },
                "bi": {
                  "label": "Gauss-Kruger"
                },
                "bj": {
                  "label": "Equirectangular"
                },
                "bk": {
                  "label": "Krovak"
                },
                "bl": {
                  "label": "Cassini-Soldner"
                },
                "bo": {
                  "label": "Oblique Mercator"
                },
                "br": {
                  "label": "Robinson"
                },
                "bs": {
                  "label": "Space oblique Mercator"
                },
                "bu": {
                  "label": "Cylindrical, specific type unknown"
                },
                "bz": {
                  "label": "Cylindrical, other"
                },
                "ca": {
                  "label": "Albers equal area"
                },
                "cb": {
                  "label": "Bonne"
                },
                "cc": {
                  "label": "Lambert's conformal conic"
                },
                "ce": {
                  "label": "Equidistant conic"
                },
                "cp": {
                  "label": "Polyconic"
                },
                "cu": {
                  "label": "Conic, specific type unknown"
                },
                "cz": {
                  "label": "Conic, other"
                },
                "da": {
                  "label": "Armadillo"
                },
                "db": {
                  "label": "Butterfly"
                },
                "dc": {
                  "label": "Eckert"
                },
                "dd": {
                  "label": "Goode's homolosine"
                },
                "de": {
                  "label": "Miller's bipolar oblique conformal conic"
                },
                "df": {
                  "label": "Van Der Grinten"
                },
                "dg": {
                  "label": "Dimaxion"
                },
                "dh": {
                  "label": "Cordiform"
                },
                "dl": {
                  "label": "Lambert conformal"
                },
                "zz": {
                  "label": "Other"
                },
                "||": {
                  "label": "No attempt to code"
                }
              }
            },
            "08": {
              "label": "Type of cartographic material",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                "a": {
                  "label": "Single map"
                },
                "b": {
                  "label": "Map series"
                },
                "c": {
                  "label": "Map serial"
                },
                "d": {
                  "label": "Globe"
                },
                "e": {
                  "label": "Atlas"
                },
                "f": {
                  "label": "Separate supplement to another work"
                },
                "g": {
                  "label": "Bound as part of another work"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "11": {
              "label": "Government publication",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "Not a government publication"
                },
                "a": {
                  "label": "Autonomous or semi-autonomous component"
                },
                "c": {
                  "label": "Multilocal"
                },
                "f": {
                  "label": "Federal/national"
                },
                "i": {
                  "label": "International intergovernmental"
                },
                "l": {
                  "label": "Local"
                },
                "m": {
                  "label": "Multistate"
                },
                "o": {
                  "label": "Government publication-level undetermined"
                },
                "s": {
                  "label": "State, provincial, territorial, dependent, etc."
                },
                "u": {
                  "label": "Unknown if item is government publication"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "12": {
              "label": "Form of item",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "None of the following"
                },
                "a": {
                  "label": "Microfilm"
                },
                "b": {
                  "label": "Microfiche"
                },
                "c": {
                  "label": "Microopaque"
                },
                "d": {
                  "label": "Large print"
                },
                "f": {
                  "label": "Braille"
                },
                "o": {
                  "label": "Online"
                },
                "q": {
                  "label": "Direct electronic"
                },
                "r": {
                  "label": "Regular print reproduction"
                },
                "s": {
                  "label": "Electronic"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "14": {
              "label": "Index",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                "0": {
                  "label": "No index"
                },
                "1": {
                  "label": "Index present"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "16-17": {
              "label": "Special format characteristics",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "No specified special format characteristics"
                },
                "e": {
                  "label": "Manuscript"
                },
                "j": {
                  "label": "Picture card, post card"
                },
                "k": {
                  "label": "Calendar"
                },
                "l": {
                  "label": "Puzzle"
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                "n": {
                  "label": "Game"
                },
                "o": {
                  "label": "Wall map"
                },
                "p": {
                  "label": "Playing cards"
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                "r": {
                  "label": "Loose-leaf"
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                  "label": "Other"
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                "||": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Visual Materials": {
          "positions": {
            "01-03": {
              "label": "Running time for motion pictures and videorecordings",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                "000": {
                  "label": "Running time exceeds three characters"
                },
                "001-999": {
                  "label": "Running time"
                },
                "nnn": {
                  "label": "Not applicable"
                },
                "---": {
                  "label": "Unknown"
                },
                "|||": {
                  "label": "No attempt to code"
                }
              }
            },
            "05": {
              "label": "Target audience",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "Unknown or not specified"
                },
                "a": {
                  "label": "Preschool"
                },
                "b": {
                  "label": "Primary"
                },
                "c": {
                  "label": "Pre-adolescent"
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                "d": {
                  "label": "Adolescent"
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                "e": {
                  "label": "Adult"
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                  "label": "Specialized"
                },
                "g": {
                  "label": "General"
                },
                "j": {
                  "label": "Juvenile"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "11": {
              "label": "Government publication",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "Not a government publication"
                },
                "a": {
                  "label": "Autonomous or semi-autonomous component"
                },
                "c": {
                  "label": "Multilocal"
                },
                "f": {
                  "label": "Federal/national"
                },
                "i": {
                  "label": "International intergovernmental"
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                "l": {
                  "label": "Local"
                },
                "m": {
                  "label": "Multistate"
                },
                "o": {
                  "label": "Government publication-level undetermined"
                },
                "s": {
                  "label": "State, provincial, territorial, dependent, etc."
                },
                "u": {
                  "label": "Unknown if item is government publication"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "12": {
              "label": "Form of item",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "None of the following"
                },
                "a": {
                  "label": "Microfilm"
                },
                "b": {
                  "label": "Microfiche"
                },
                "c": {
                  "label": "Microopaque"
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                  "label": "Large print"
                },
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                  "label": "Braille"
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                "o": {
                  "label": "Online"
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                "q": {
                  "label": "Direct electronic"
                },
                "r": {
                  "label": "Regular print reproduction"
                },
                "s": {
                  "label": "Electronic"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "16": {
              "label": "Type of visual material",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
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                  "label": "Art original"
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                "b": {
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                "c": {
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                "g": {
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                "l": {
                  "label": "Technical drawing"
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                "m": {
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                "n": {
                  "label": "Chart"
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                "o": {
                  "label": "Flash card"
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                "p": {
                  "label": "Microscope slide"
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                "q": {
                  "label": "Model"
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                "r": {
                  "label": "Realia"
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                "s": {
                  "label": "Slide"
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                "t": {
                  "label": "Transparency"
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                  "label": "Videorecording"
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                "w": {
                  "label": "Toy"
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                  "label": "Other"
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                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "17": {
              "label": "Technique",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
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                  "label": "Animation"
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                  "label": "Animation and live action"
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                "l": {
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                  "label": "Not applicable"
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                "u": {
                  "label": "Unknown"
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                  "label": "Other"
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                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Computer Files": {
          "positions": {
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              "label": "Target audience",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
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                  "label": "Unknown or not specified"
                },
                "a": {
                  "label": "Preschool"
                },
                "b": {
                  "label": "Primary"
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                "c": {
                  "label": "Pre-adolescent"
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                  "label": "General"
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                "j": {
                  "label": "Juvenile"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
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              "label": "Form of item",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "Unknown or not specified"
                },
                "o": {
                  "label": "Online"
                },
                "q": {
                  "label": "Direct electronic"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "09": {
              "label": "Type of computer file",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
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                  "label": "Numeric data"
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                "i": {
                  "label": "Interactive multimedia"
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                  "label": "Online system or service"
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                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
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              "label": "Government publication",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
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                " ": {
                  "label": "Not a government publication"
                },
                "a": {
                  "label": "Autonomous or semi-autonomous component"
                },
                "c": {
                  "label": "Multilocal"
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                  "label": "Federal/national"
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                "i": {
                  "label": "International intergovernmental"
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                "l": {
                  "label": "Local"
                },
                "m": {
                  "label": "Multistate"
                },
                "o": {
                  "label": "Government publication-level undetermined"
                },
                "s": {
                  "label": "State, provincial, territorial, dependent, etc."
                },
                "u": {
                  "label": "Unknown if item is government publication"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Mixed Materials": {
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              "label": "Form of item",
              "url": "https://www.loc.gov/marc/bibliographic/bd006.html",
              "codes": {
                " ": {
                  "label": "None of the following"
                },
                "a": {
                  "label": "Microfilm"
                },
                "b": {
                  "label": "Microfiche"
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                  "label": "Microopaque"
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                  "label": "Large print"
                },
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                  "label": "Online"
                },
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                  "label": "Direct electronic"
                },
                "r": {
                  "label": "Regular print reproduction"
                },
                "s": {
                  "label": "Electronic"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        }
      }
    },
    "007": {
      "tag": "007",
      "label": "Physical Description",
      "repeatable": true,
      "types": {
        "Common": {
          "positions": {
            "00": {
              "label": "Category of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007c.html",
              "codes": {
                "c": {
                  "label": "Electronic resource"
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              }
            }
          }
        },
        "Map": {
          "positions": {
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              "label": "Category of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007a.html",
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                  "label": "Map"
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              }
            },
            "01": {
              "label": "Specific material designation",
              "url": "https://www.loc.gov/marc/bibliographic/bd007a.html",
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                },
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                  "label": "Diagram"
                },
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                "q": {
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                "y": {
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                  "label": "Other"
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                  "label": "No attempt to code"
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                  "label": "Aerial remote-sensing image"
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                  "label": "Anamorphic map"
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                  "label": "Photo mosaic (uncontrolled)"
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                  "label": "Plan"
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                  "label": "Space remote-sensing image"
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              }
            },
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              "label": "Color",
              "url": "https://www.loc.gov/marc/bibliographic/bd007a.html",
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                  "label": "One color"
                },
                "c": {
                  "label": "Multicolored"
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                "|": {
                  "label": "No attempt to code"
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              }
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              "url": "https://www.loc.gov/marc/bibliographic/bd007a.html",
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                  "label": "Textiles"
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                "i": {
                  "label": "Plastic"
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                "j": {
                  "label": "Glass"
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                "l": {
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                  "label": "Vellum"
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                "p": {
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                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
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              "label": "Type of reproduction",
              "url": "https://www.loc.gov/marc/bibliographic/bd007a.html",
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                  "label": "Facsimile"
                },
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                  "label": "Not applicable"
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                  "label": "Unknown"
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                },
                "|": {
                  "label": "No attempt to code"
                }
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              "label": "Production/reproduction details",
              "url": "https://www.loc.gov/marc/bibliographic/bd007a.html",
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                  "label": "Photocopy, blueline print"
                },
                "b": {
                  "label": "Photocopy"
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                  "label": "Pre-production"
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                  "label": "Unknown"
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                  "label": "Other"
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                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "07": {
              "label": "Positive/negative aspect",
              "url": "https://www.loc.gov/marc/bibliographic/bd007a.html",
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                  "label": "Positive"
                },
                "b": {
                  "label": "Negative"
                },
                "m": {
                  "label": "Mixed polarity"
                },
                "n": {
                  "label": "Not applicable"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "u": {
                  "label": "Unknown [OBSOLETE, 1997] [CAN/MARC only]"
                }
              }
            }
          }
        },
        "Electronic resource": {
          "positions": {
            "00": {
              "label": "Category of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007c.html",
              "codes": {
                "c": {
                  "label": "Electronic resource"
                }
              }
            },
            "01": {
              "label": "Specific material designation",
              "url": "https://www.loc.gov/marc/bibliographic/bd007c.html",
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                  "label": "Tape cartridge"
                },
                "b": {
                  "label": "Chip cartridge"
                },
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                  "label": "Computer optical disc cartridge"
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                  "label": "Remote"
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                  "label": "Standalone device"
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                  "label": "Unspecified"
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                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
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              "label": "Color",
              "url": "https://www.loc.gov/marc/bibliographic/bd007c.html",
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                "a": {
                  "label": "One color"
                },
                "b": {
                  "label": "Black-and-white"
                },
                "c": {
                  "label": "Multicolored"
                },
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                  "label": "Mixed"
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                  "label": "Not applicable"
                },
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                  "label": "Unknown"
                },
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                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
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                  "label": "Hand coloured [OBSOLETE, 1997] [CAN/MARC only]"
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              "label": "Dimensions",
              "url": "https://www.loc.gov/marc/bibliographic/bd007c.html",
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                  "label": "3 1/2 in."
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                  "label": "12 in."
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                  "label": "4 3/4 in. or 12 cm."
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                "i": {
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                  "label": "3 7/8 x 2 1/2 in."
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                  "label": "Not applicable"
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                  "label": "5 1/4 in."
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                  "label": "Unknown"
                },
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                  "label": "8 in."
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "05": {
              "label": "Sound",
              "url": "https://www.loc.gov/marc/bibliographic/bd007c.html",
              "codes": {
                " ": {
                  "label": "No sound (silent)"
                },
                "a": {
                  "label": "Sound"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "06-08": {
              "label": "Image bit depth",
              "url": "https://www.loc.gov/marc/bibliographic/bd007c.html",
              "codes": {
                "001-999": {
                  "label": "Exact bit depth"
                },
                "mmm": {
                  "label": "Multiple"
                },
                "nnn": {
                  "label": "Not applicable"
                },
                "---": {
                  "label": "Unknown"
                },
                "|||": {
                  "label": "No attempt to code"
                }
              }
            },
            "09": {
              "label": "File formats",
              "url": "https://www.loc.gov/marc/bibliographic/bd007c.html",
              "codes": {
                "a": {
                  "label": "One file format"
                },
                "m": {
                  "label": "Multiple file formats"
                },
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                  "label": "Unknown"
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                "|": {
                  "label": "No attempt to code"
                }
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            },
            "10": {
              "label": "Quality assurance targets",
              "url": "https://www.loc.gov/marc/bibliographic/bd007c.html",
              "codes": {
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                  "label": "Absent"
                },
                "n": {
                  "label": "Not applicable"
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                "p": {
                  "label": "Present"
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                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "11": {
              "label": "Antecedent/source",
              "url": "https://www.loc.gov/marc/bibliographic/bd007c.html",
              "codes": {
                "a": {
                  "label": "File reproduced from original"
                },
                "b": {
                  "label": "File reproduced from microform"
                },
                "c": {
                  "label": "File reproduced from an electronic resource"
                },
                "d": {
                  "label": "File reproduced from an intermediate (not microform)"
                },
                "m": {
                  "label": "Mixed"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "12": {
              "label": "Level of compression",
              "url": "https://www.loc.gov/marc/bibliographic/bd007c.html",
              "codes": {
                "a": {
                  "label": "Uncompressed"
                },
                "b": {
                  "label": "Lossless"
                },
                "d": {
                  "label": "Lossy"
                },
                "m": {
                  "label": "Mixed"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "13": {
              "label": "Reformatting quality",
              "url": "https://www.loc.gov/marc/bibliographic/bd007c.html",
              "codes": {
                "a": {
                  "label": "Access"
                },
                "n": {
                  "label": "Not applicable"
                },
                "p": {
                  "label": "Preservation"
                },
                "r": {
                  "label": "Replacement"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Globe": {
          "positions": {
            "00": {
              "label": "Category of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007d.html",
              "codes": {
                "d": {
                  "label": "Globe"
                }
              }
            },
            "01": {
              "label": "Specific material designation",
              "url": "https://www.loc.gov/marc/bibliographic/bd007d.html",
              "codes": {
                "a": {
                  "label": "Celestial globe"
                },
                "b": {
                  "label": "Planetary or lunar globe"
                },
                "c": {
                  "label": "Terrestrial globe"
                },
                "e": {
                  "label": "Earth moon globe"
                },
                "u": {
                  "label": "Unspecified"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "d": {
                  "label": "Satellite globe (of our solar system), excluding the earth moon [OBSOLETE, 1997] [CAN/MARC only]"
                }
              }
            },
            "03": {
              "label": "Color",
              "url": "https://www.loc.gov/marc/bibliographic/bd007d.html",
              "codes": {
                "a": {
                  "label": "One color"
                },
                "c": {
                  "label": "Multicolored"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "b": {
                  "label": "Multicolored [OBSOLETE, 1982]"
                }
              }
            },
            "04": {
              "label": "Physical medium",
              "url": "https://www.loc.gov/marc/bibliographic/bd007d.html",
              "codes": {
                "a": {
                  "label": "Paper"
                },
                "b": {
                  "label": "Wood"
                },
                "c": {
                  "label": "Stone"
                },
                "d": {
                  "label": "Metal"
                },
                "e": {
                  "label": "Synthetic"
                },
                "f": {
                  "label": "Skin"
                },
                "g": {
                  "label": "Textile"
                },
                "i": {
                  "label": "Plastic"
                },
                "l": {
                  "label": "Vinyl"
                },
                "n": {
                  "label": "Vellum"
                },
                "p": {
                  "label": "Plaster"
                },
                "u": {
                  "label": "Unknown"
                },
                "v": {
                  "label": "Leather"
                },
                "w": {
                  "label": "Parchment"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "05": {
              "label": "Type of reproduction",
              "url": "https://www.loc.gov/marc/bibliographic/bd007d.html",
              "codes": {
                "f": {
                  "label": "Facsimile"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Tactile material": {
          "positions": {
            "00": {
              "label": "Category of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007f.html",
              "codes": {
                "f": {
                  "label": "Tactile material"
                }
              }
            },
            "01": {
              "label": "Specific material designation",
              "url": "https://www.loc.gov/marc/bibliographic/bd007f.html",
              "codes": {
                "a": {
                  "label": "Moon"
                },
                "b": {
                  "label": "Braille"
                },
                "c": {
                  "label": "Combination"
                },
                "d": {
                  "label": "Tactile, with no writing system"
                },
                "u": {
                  "label": "Unspecified"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "03-04": {
              "label": "Class of braille writing",
              "url": "https://www.loc.gov/marc/bibliographic/bd007f.html",
              "codes": {
                " ": {
                  "label": "No specified class of braille writing"
                },
                "a": {
                  "label": "Literary braille"
                },
                "b": {
                  "label": "Format code braille"
                },
                "c": {
                  "label": "Mathematics and scientific braille"
                },
                "d": {
                  "label": "Computer braille"
                },
                "e": {
                  "label": "Music braille"
                },
                "m": {
                  "label": "Multiple braille types"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "||": {
                  "label": "No attempt to code"
                }
              }
            },
            "05": {
              "label": "Level of contraction",
              "url": "https://www.loc.gov/marc/bibliographic/bd007f.html",
              "codes": {
                "a": {
                  "label": "Uncontracted"
                },
                "b": {
                  "label": "Contracted"
                },
                "m": {
                  "label": "Combination"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "06-08": {
              "label": "Braille music format",
              "url": "https://www.loc.gov/marc/bibliographic/bd007f.html",
              "codes": {
                " ": {
                  "label": "No specified braille music format"
                },
                "a": {
                  "label": "Bar over bar"
                },
                "b": {
                  "label": "Bar by bar"
                },
                "c": {
                  "label": "Line over line"
                },
                "d": {
                  "label": "Paragraph"
                },
                "e": {
                  "label": "Single line"
                },
                "f": {
                  "label": "Section by section"
                },
                "g": {
                  "label": "Line by line"
                },
                "h": {
                  "label": "Open score"
                },
                "i": {
                  "label": "Spanner short form scoring"
                },
                "j": {
                  "label": "Short form scoring"
                },
                "k": {
                  "label": "Outline"
                },
                "l": {
                  "label": "Vertical score"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "09": {
              "label": "Special physical characteristics",
              "url": "https://www.loc.gov/marc/bibliographic/bd007f.html",
              "codes": {
                "a": {
                  "label": "Print/braille"
                },
                "b": {
                  "label": "Jumbo or enlarged braille"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Projected graphic": {
          "positions": {
            "00": {
              "label": "Category of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007g.html",
              "codes": {
                "g": {
                  "label": "Projected graphic"
                }
              }
            },
            "01": {
              "label": "Specific material designation",
              "url": "https://www.loc.gov/marc/bibliographic/bd007g.html",
              "codes": {
                "c": {
                  "label": "Filmstrip cartridge"
                },
                "d": {
                  "label": "Filmslip"
                },
                "f": {
                  "label": "Filmstrip, type unspecified"
                },
                "o": {
                  "label": "Filmstrip roll"
                },
                "s": {
                  "label": "Slide"
                },
                "t": {
                  "label": "Transparency"
                },
                "u": {
                  "label": "Unspecified"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                " ": {
                  "label": "Not applicable or no attempt to code [OBSOLETE, 1980]"
                },
                "n": {
                  "label": "Not applicable [OBSOLETE, 1981] [USMARC only]"
                }
              }
            },
            "03": {
              "label": "Color",
              "url": "https://www.loc.gov/marc/bibliographic/bd007g.html",
              "codes": {
                "a": {
                  "label": "One color"
                },
                "b": {
                  "label": "Black-and-white"
                },
                "c": {
                  "label": "Multicolored"
                },
                "h": {
                  "label": "Hand colored"
                },
                "m": {
                  "label": "Mixed"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "04": {
              "label": "Base of emulsion",
              "url": "https://www.loc.gov/marc/bibliographic/bd007g.html",
              "codes": {
                "d": {
                  "label": "Glass"
                },
                "e": {
                  "label": "Synthetic"
                },
                "j": {
                  "label": "Safety film"
                },
                "k": {
                  "label": "Film base, other than safety film"
                },
                "m": {
                  "label": "Mixed collection"
                },
                "o": {
                  "label": "Paper"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                " ": {
                  "label": "Not applicable or no attempt to code [OBSOLETE, 1980]"
                },
                "n": {
                  "label": "Not applicable [OBSOLETE, 1981]"
                }
              }
            },
            "05": {
              "label": "Sound on medium or separate",
              "url": "https://www.loc.gov/marc/bibliographic/bd007g.html",
              "codes": {
                " ": {
                  "label": "No sound (silent)"
                },
                "a": {
                  "label": "Sound on medium"
                },
                "b": {
                  "label": "Sound separate from medium"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "06": {
              "label": "Medium for sound",
              "url": "https://www.loc.gov/marc/bibliographic/bd007g.html",
              "codes": {
                " ": {
                  "label": "No sound (silent)"
                },
                "a": {
                  "label": "Optical sound track on motion picture film"
                },
                "b": {
                  "label": "Magnetic sound track on motion picture film"
                },
                "c": {
                  "label": "Magnetic audio tape in cartridge"
                },
                "d": {
                  "label": "Sound disc"
                },
                "e": {
                  "label": "Magnetic audio tape on reel"
                },
                "f": {
                  "label": "Magnetic audio tape in cassette"
                },
                "g": {
                  "label": "Optical and magnetic sound track on motion picture film"
                },
                "h": {
                  "label": "Videotape"
                },
                "i": {
                  "label": "Videodisc"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "g": {
                  "label": "Other [OBSOLETE, 1981]"
                }
              }
            },
            "07": {
              "label": "Dimensions",
              "url": "https://www.loc.gov/marc/bibliographic/bd007g.html",
              "codes": {
                "a": {
                  "label": "Standard 8 mm. film width"
                },
                "b": {
                  "label": "Super 8 mm./single 8 mm. film width"
                },
                "c": {
                  "label": "9.5 mm. film width"
                },
                "d": {
                  "label": "16 mm. film width"
                },
                "e": {
                  "label": "28 mm. film width"
                },
                "f": {
                  "label": "35 mm. film width"
                },
                "g": {
                  "label": "70 mm. film width"
                },
                "j": {
                  "label": "2x2 in. or 5x5 cm. slide"
                },
                "k": {
                  "label": "2 1/4 x 2 1/4 in. or 6x6 cm. slide"
                },
                "s": {
                  "label": "4x5 in. or 10x13 cm. transparency"
                },
                "t": {
                  "label": "5x7 in. or 13x18 cm. transparency"
                },
                "v": {
                  "label": "8x10 in. or 21x26 cm. transparency"
                },
                "w": {
                  "label": "9x9 in. or 23x23 cm. transparency"
                },
                "x": {
                  "label": "10x10 in. or 26x26 cm. transparency"
                },
                "y": {
                  "label": "7x7 in. or 18x18 cm. transparency"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "u": {
                  "label": "7x7 in. or 18x18 cm. [OBSOLETE, 1980]"
                },
                "y": {
                  "label": "Unknown [OBSOLETE, 1980]"
                }
              }
            },
            "08": {
              "label": "Secondary support material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007g.html",
              "codes": {
                " ": {
                  "label": "No secondary support"
                },
                "c": {
                  "label": "Cardboard"
                },
                "d": {
                  "label": "Glass"
                },
                "e": {
                  "label": "Synthetic"
                },
                "h": {
                  "label": "Metal"
                },
                "j": {
                  "label": "Metal and glass"
                },
                "k": {
                  "label": "Synthetic and glass"
                },
                "m": {
                  "label": "Mixed collection"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Microform": {
          "positions": {
            "00": {
              "label": "Category of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007h.html",
              "codes": {
                "h": {
                  "label": "Microform"
                }
              }
            },
            "01": {
              "label": "Specific material designation",
              "url": "https://www.loc.gov/marc/bibliographic/bd007h.html",
              "codes": {
                "a": {
                  "label": "Aperture card"
                },
                "b": {
                  "label": "Microfilm cartridge"
                },
                "c": {
                  "label": "Microfilm cassette"
                },
                "d": {
                  "label": "Microfilm reel"
                },
                "e": {
                  "label": "Microfiche"
                },
                "f": {
                  "label": "Microfiche cassette"
                },
                "g": {
                  "label": "Microopaque"
                },
                "h": {
                  "label": "Microfilm slip"
                },
                "j": {
                  "label": "Microfilm roll"
                },
                "u": {
                  "label": "Unspecified"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "03": {
              "label": "Positive/negative aspect",
              "url": "https://www.loc.gov/marc/bibliographic/bd007h.html",
              "codes": {
                "a": {
                  "label": "Positive"
                },
                "b": {
                  "label": "Negative"
                },
                "m": {
                  "label": "Mixed polarity"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "04": {
              "label": "Dimensions",
              "url": "https://www.loc.gov/marc/bibliographic/bd007h.html",
              "codes": {
                "a": {
                  "label": "8 mm."
                },
                "d": {
                  "label": "16 mm."
                },
                "f": {
                  "label": "35 mm."
                },
                "g": {
                  "label": "70 mm."
                },
                "h": {
                  "label": "105 mm."
                },
                "l": {
                  "label": "3x5 in. or 8x13 cm."
                },
                "m": {
                  "label": "4x6 in. or 11x15 cm."
                },
                "o": {
                  "label": "6x9 in. or 16x23 cm."
                },
                "p": {
                  "label": "3 1/4 x 7 3/8 in. or 9x19 cm."
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "05": {
              "label": "Reduction ratio range",
              "url": "https://www.loc.gov/marc/bibliographic/bd007h.html",
              "codes": {
                "a": {
                  "label": "Low reduction ratio"
                },
                "b": {
                  "label": "Normal reduction"
                },
                "c": {
                  "label": "High reduction"
                },
                "d": {
                  "label": "Very high reduction"
                },
                "e": {
                  "label": "Ultra high reduction"
                },
                "u": {
                  "label": "Unknown"
                },
                "v": {
                  "label": "Reduction rate varies"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "06-08": {
              "label": "Reduction ratio",
              "url": "https://www.loc.gov/marc/bibliographic/bd007h.html"
            },
            "09": {
              "label": "Color",
              "url": "https://www.loc.gov/marc/bibliographic/bd007h.html",
              "codes": {
                "b": {
                  "label": "Black-and-white"
                },
                "c": {
                  "label": "Multicolored"
                },
                "m": {
                  "label": "Mixed"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "10": {
              "label": "Emulsion on film",
              "url": "https://www.loc.gov/marc/bibliographic/bd007h.html",
              "codes": {
                "a": {
                  "label": "Silver halide"
                },
                "b": {
                  "label": "Diazo"
                },
                "c": {
                  "label": "Vesicular"
                },
                "m": {
                  "label": "Mixed emulsion"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "11": {
              "label": "Generation",
              "url": "https://www.loc.gov/marc/bibliographic/bd007h.html",
              "codes": {
                "a": {
                  "label": "First generation (master)"
                },
                "b": {
                  "label": "Printing master"
                },
                "c": {
                  "label": "Service copy"
                },
                "m": {
                  "label": "Mixed generation"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "12": {
              "label": "Base of film",
              "url": "https://www.loc.gov/marc/bibliographic/bd007h.html",
              "codes": {
                "a": {
                  "label": "Safety base, undetermined"
                },
                "c": {
                  "label": "Safety base, acetate undetermined"
                },
                "d": {
                  "label": "Safety base, diacetate"
                },
                "i": {
                  "label": "Nitrate base"
                },
                "m": {
                  "label": "Mixed base (nitrate and safety)"
                },
                "n": {
                  "label": "Not applicable"
                },
                "p": {
                  "label": "Safety base, polyester"
                },
                "r": {
                  "label": "Safety base, mixed"
                },
                "t": {
                  "label": "Safety base, triacetate"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "b": {
                  "label": "Not safety base [OBSOLETE, 1991]"
                }
              }
            }
          }
        },
        "Nonprojected graphic": {
          "positions": {
            "00": {
              "label": "Category of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007k.html",
              "codes": {
                "k": {
                  "label": "Nonprojected graphic"
                }
              }
            },
            "01": {
              "label": "Specific material designation",
              "url": "https://www.loc.gov/marc/bibliographic/bd007k.html",
              "codes": {
                "a": {
                  "label": "Activity card"
                },
                "c": {
                  "label": "Collage"
                },
                "d": {
                  "label": "Drawing"
                },
                "e": {
                  "label": "Painting"
                },
                "f": {
                  "label": "Photomechanical print"
                },
                "g": {
                  "label": "Photonegative"
                },
                "h": {
                  "label": "Photoprint"
                },
                "i": {
                  "label": "Picture"
                },
                "j": {
                  "label": "Print"
                },
                "k": {
                  "label": "Poster"
                },
                "l": {
                  "label": "Technical drawing"
                },
                "n": {
                  "label": "Chart"
                },
                "o": {
                  "label": "Flash card"
                },
                "p": {
                  "label": "Postcard"
                },
                "q": {
                  "label": "Icon"
                },
                "r": {
                  "label": "Radiograph"
                },
                "s": {
                  "label": "Study print"
                },
                "u": {
                  "label": "Unspecified"
                },
                "v": {
                  "label": "Photograph, type unspecified"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "03": {
              "label": "Color",
              "url": "https://www.loc.gov/marc/bibliographic/bd007k.html",
              "codes": {
                "a": {
                  "label": "One color"
                },
                "b": {
                  "label": "Black-and-white"
                },
                "c": {
                  "label": "Multicolored"
                },
                "h": {
                  "label": "Hand colored"
                },
                "m": {
                  "label": "Mixed"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "04": {
              "label": "Primary support material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007k.html",
              "codes": {
                "a": {
                  "label": "Canvas"
                },
                "b": {
                  "label": "Bristol board"
                },
                "c": {
                  "label": "Cardboard/illustration board"
                },
                "d": {
                  "label": "Glass"
                },
                "e": {
                  "label": "Synthetic"
                },
                "f": {
                  "label": "Skin"
                },
                "g": {
                  "label": "Textile"
                },
                "h": {
                  "label": "Metal"
                },
                "i": {
                  "label": "Plastic"
                },
                "l": {
                  "label": "Vinyl"
                },
                "m": {
                  "label": "Mixed collection"
                },
                "n": {
                  "label": "Vellum"
                },
                "o": {
                  "label": "Paper"
                },
                "p": {
                  "label": "Plaster"
                },
                "q": {
                  "label": "Hardboard"
                },
                "r": {
                  "label": "Porcelain"
                },
                "s": {
                  "label": "Stone"
                },
                "t": {
                  "label": "Wood"
                },
                "u": {
                  "label": "Unknown"
                },
                "v": {
                  "label": "Leather"
                },
                "w": {
                  "label": "Parchment"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "05": {
              "label": "Secondary support material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007k.html",
              "codes": {
                " ": {
                  "label": "No secondary support"
                },
                "a": {
                  "label": "Canvas"
                },
                "b": {
                  "label": "Bristol board"
                },
                "c": {
                  "label": "Cardboard/illustration board"
                },
                "d": {
                  "label": "Glass"
                },
                "e": {
                  "label": "Synthetic"
                },
                "f": {
                  "label": "Skin"
                },
                "g": {
                  "label": "Textile"
                },
                "h": {
                  "label": "Metal"
                },
                "i": {
                  "label": "Plastic"
                },
                "l": {
                  "label": "Vinyl"
                },
                "m": {
                  "label": "Mixed collection"
                },
                "n": {
                  "label": "Vellum"
                },
                "o": {
                  "label": "Paper"
                },
                "p": {
                  "label": "Plaster"
                },
                "q": {
                  "label": "Hardboard"
                },
                "r": {
                  "label": "Porcelain"
                },
                "s": {
                  "label": "Stone"
                },
                "t": {
                  "label": "Wood"
                },
                "u": {
                  "label": "Unknown"
                },
                "v": {
                  "label": "Leather"
                },
                "w": {
                  "label": "Parchment"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Motion picture": {
          "positions": {
            "00": {
              "label": "Category of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007m.html",
              "codes": {
                "m": {
                  "label": "Motion picture"
                }
              }
            },
            "01": {
              "label": "Specific material designation",
              "url": "https://www.loc.gov/marc/bibliographic/bd007m.html",
              "codes": {
                "c": {
                  "label": "Film cartridge"
                },
                "f": {
                  "label": "Film cassette"
                },
                "o": {
                  "label": "Film roll"
                },
                "r": {
                  "label": "Film reel"
                },
                "u": {
                  "label": "Unspecified"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "03": {
              "label": "Color",
              "url": "https://www.loc.gov/marc/bibliographic/bd007m.html",
              "codes": {
                "b": {
                  "label": "Black-and-white"
                },
                "c": {
                  "label": "Multicolored"
                },
                "h": {
                  "label": "Hand colored"
                },
                "m": {
                  "label": "Mixed"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "04": {
              "label": "Motion picture presentation format",
              "url": "https://www.loc.gov/marc/bibliographic/bd007m.html",
              "codes": {
                "a": {
                  "label": "Standard sound aperture (reduced frame)"
                },
                "b": {
                  "label": "Nonanamorphic (wide-screen)"
                },
                "c": {
                  "label": "3D"
                },
                "d": {
                  "label": "Anamorphic (wide-screen)"
                },
                "e": {
                  "label": "Other wide-screen format"
                },
                "f": {
                  "label": "Standard silent aperture (full frame)"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "n": {
                  "label": "Not applicable [OBSOLETE, 1983]"
                }
              }
            },
            "05": {
              "label": "Sound on medium or separate",
              "url": "https://www.loc.gov/marc/bibliographic/bd007m.html",
              "codes": {
                " ": {
                  "label": "No sound (silent)"
                },
                "a": {
                  "label": "Sound on medium"
                },
                "b": {
                  "label": "Sound separate from medium"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "06": {
              "label": "Medium for sound",
              "url": "https://www.loc.gov/marc/bibliographic/bd007m.html",
              "codes": {
                " ": {
                  "label": "No sound (silent)"
                },
                "a": {
                  "label": "Optical sound track on motion picture film"
                },
                "b": {
                  "label": "Magnetic sound track on motion picture film"
                },
                "c": {
                  "label": "Magnetic audio tape in cartridge"
                },
                "d": {
                  "label": "Sound disc"
                },
                "e": {
                  "label": "Magnetic audio tape on reel"
                },
                "f": {
                  "label": "Magnetic audio tape in cassette"
                },
                "g": {
                  "label": "Optical and magnetic sound track on motion picture film"
                },
                "h": {
                  "label": "Videotape"
                },
                "i": {
                  "label": "Videodisc"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "07": {
              "label": "Dimensions",
              "url": "https://www.loc.gov/marc/bibliographic/bd007m.html",
              "codes": {
                "a": {
                  "label": "Standard 8 mm."
                },
                "b": {
                  "label": "Super 8 mm./single 8 mm."
                },
                "c": {
                  "label": "9.5 mm."
                },
                "d": {
                  "label": "16 mm."
                },
                "e": {
                  "label": "28 mm."
                },
                "f": {
                  "label": "35 mm."
                },
                "g": {
                  "label": "70 mm."
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "08": {
              "label": "Configuration of playback channels",
              "url": "https://www.loc.gov/marc/bibliographic/bd007m.html",
              "codes": {
                "k": {
                  "label": "Mixed"
                },
                "m": {
                  "label": "Monaural"
                },
                "n": {
                  "label": "Not applicable"
                },
                "q": {
                  "label": "Quadraphonic, multichannel, or surround"
                },
                "s": {
                  "label": "Stereophonic"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "09": {
              "label": "Production elements",
              "url": "https://www.loc.gov/marc/bibliographic/bd007m.html",
              "codes": {
                "a": {
                  "label": "Workprint"
                },
                "b": {
                  "label": "Trims"
                },
                "c": {
                  "label": "Outtakes"
                },
                "d": {
                  "label": "Rushes"
                },
                "e": {
                  "label": "Mixing tracks"
                },
                "f": {
                  "label": "Title bands/inter-title rolls"
                },
                "g": {
                  "label": "Production rolls"
                },
                "n": {
                  "label": "Not applicable"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "h": {
                  "label": "Other [OBSOLETE, 1988]"
                }
              }
            },
            "10": {
              "label": "Positive/negative aspect",
              "url": "https://www.loc.gov/marc/bibliographic/bd007m.html",
              "codes": {
                "a": {
                  "label": "Positive"
                },
                "b": {
                  "label": "Negative"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "11": {
              "label": "Generation",
              "url": "https://www.loc.gov/marc/bibliographic/bd007m.html",
              "codes": {
                "d": {
                  "label": "Duplicate"
                },
                "e": {
                  "label": "Master"
                },
                "o": {
                  "label": "Original"
                },
                "r": {
                  "label": "Reference print/viewing copy"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "12": {
              "label": "Base of film",
              "url": "https://www.loc.gov/marc/bibliographic/bd007m.html",
              "codes": {
                "a": {
                  "label": "Safety base, undetermined"
                },
                "c": {
                  "label": "Safety base, acetate undetermined"
                },
                "d": {
                  "label": "Safety base, diacetate"
                },
                "i": {
                  "label": "Nitrate base"
                },
                "m": {
                  "label": "Mixed base (nitrate and safety)"
                },
                "n": {
                  "label": "Not applicable"
                },
                "p": {
                  "label": "Safety base, polyester"
                },
                "r": {
                  "label": "Safety base, mixed"
                },
                "t": {
                  "label": "Safety base, triacetate"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "13": {
              "label": "Refined categories of color",
              "url": "https://www.loc.gov/marc/bibliographic/bd007m.html",
              "codes": {
                "a": {
                  "label": "3 layer color"
                },
                "b": {
                  "label": "2 color, single strip"
                },
                "c": {
                  "label": "Undetermined 2 color"
                },
                "d": {
                  "label": "Undetermined 3 color"
                },
                "e": {
                  "label": "3 strip color"
                },
                "f": {
                  "label": "2 strip color"
                },
                "g": {
                  "label": "Red strip"
                },
                "h": {
                  "label": "Blue or green strip"
                },
                "i": {
                  "label": "Cyan strip"
                },
                "j": {
                  "label": "Magenta strip"
                },
                "k": {
                  "label": "Yellow strip"
                },
                "l": {
                  "label": "S E N 2"
                },
                "m": {
                  "label": "S E N 3"
                },
                "n": {
                  "label": "Not applicable"
                },
                "p": {
                  "label": "Sepia tone"
                },
                "q": {
                  "label": "Other tone"
                },
                "r": {
                  "label": "Tint"
                },
                "s": {
                  "label": "Tinted and toned"
                },
                "t": {
                  "label": "Stencil color"
                },
                "u": {
                  "label": "Unknown"
                },
                "v": {
                  "label": "Hand colored"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "14": {
              "label": "Kind of color stock or print",
              "url": "https://www.loc.gov/marc/bibliographic/bd007m.html",
              "codes": {
                "a": {
                  "label": "Imbibition dye transfer prints"
                },
                "b": {
                  "label": "Three-layer stock"
                },
                "c": {
                  "label": "Three layer stock, low fade"
                },
                "d": {
                  "label": "Duplitized stock"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "15": {
              "label": "Deterioration stage",
              "url": "https://www.loc.gov/marc/bibliographic/bd007m.html",
              "codes": {
                "a": {
                  "label": "None apparent"
                },
                "b": {
                  "label": "Nitrate: suspicious odor"
                },
                "c": {
                  "label": "Nitrate: pungent odor"
                },
                "d": {
                  "label": "Nitrate: brownish, discoloration, fading, dusty"
                },
                "e": {
                  "label": "Nitrate: sticky"
                },
                "f": {
                  "label": "Nitrate: frothy, bubbles, blisters"
                },
                "g": {
                  "label": "Nitrate: congealed"
                },
                "h": {
                  "label": "Nitrate: powder"
                },
                "k": {
                  "label": "Non-nitrate: detectable deterioration"
                },
                "l": {
                  "label": "Non-nitrate: advanced deterioration"
                },
                "m": {
                  "label": "Non-nitrate: disaster"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "16": {
              "label": "Completeness",
              "url": "https://www.loc.gov/marc/bibliographic/bd007m.html",
              "codes": {
                "c": {
                  "label": "Complete"
                },
                "i": {
                  "label": "Incomplete"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "17-22": {
              "label": "Film inspection date",
              "url": "https://www.loc.gov/marc/bibliographic/bd007m.html"
            }
          }
        },
        "Kit": {
          "positions": {
            "00": {
              "label": "Category of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007o.html",
              "codes": {
                "o": {
                  "label": "Kit"
                }
              }
            },
            "01": {
              "label": "Specific material designation",
              "url": "https://www.loc.gov/marc/bibliographic/bd007o.html",
              "codes": {
                "u": {
                  "label": "Unspecified"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Notated music": {
          "positions": {
            "00": {
              "label": "Category of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007q.html",
              "codes": {
                "q": {
                  "label": "Notated music"
                }
              }
            },
            "01": {
              "label": "Specific material designation",
              "url": "https://www.loc.gov/marc/bibliographic/bd007q.html",
              "codes": {
                "u": {
                  "label": "Unspecified"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Remote-sensing image": {
          "positions": {
            "00": {
              "label": "Category of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007r.html",
              "codes": {
                "r": {
                  "label": "Remote-sensing image"
                }
              }
            },
            "01": {
              "label": "Specific material designation",
              "url": "https://www.loc.gov/marc/bibliographic/bd007r.html",
              "codes": {
                "u": {
                  "label": "Unspecified"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                " ": {
                  "label": "No type specified [OBSOLETE, 1998]"
                }
              }
            },
            "03": {
              "label": "Altitude of sensor",
              "url": "https://www.loc.gov/marc/bibliographic/bd007r.html",
              "codes": {
                "a": {
                  "label": "Surface"
                },
                "b": {
                  "label": "Airborne"
                },
                "c": {
                  "label": "Spaceborne"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "04": {
              "label": "Attitude of sensor",
              "url": "https://www.loc.gov/marc/bibliographic/bd007r.html",
              "codes": {
                "a": {
                  "label": "Low oblique"
                },
                "b": {
                  "label": "High oblique"
                },
                "c": {
                  "label": "Vertical"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "05": {
              "label": "Cloud cover",
              "url": "https://www.loc.gov/marc/bibliographic/bd007r.html",
              "codes": {
                "0": {
                  "label": "0-9%"
                },
                "1": {
                  "label": "10-19%"
                },
                "2": {
                  "label": "20-29%"
                },
                "3": {
                  "label": "30-39%"
                },
                "4": {
                  "label": "40-49%"
                },
                "5": {
                  "label": "50-59%"
                },
                "6": {
                  "label": "60-69%"
                },
                "7": {
                  "label": "70-79%"
                },
                "8": {
                  "label": "80-89%"
                },
                "9": {
                  "label": "90-100%"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "06": {
              "label": "Platform construction type",
              "url": "https://www.loc.gov/marc/bibliographic/bd007r.html",
              "codes": {
                "a": {
                  "label": "Balloon"
                },
                "b": {
                  "label": "Aircraft--low altitude"
                },
                "c": {
                  "label": "Aircraft--medium altitude"
                },
                "d": {
                  "label": "Aircraft--high altitude"
                },
                "e": {
                  "label": "Manned spacecraft"
                },
                "f": {
                  "label": "Unmanned spacecraft"
                },
                "g": {
                  "label": "Land-based remote-sensing device"
                },
                "h": {
                  "label": "Water surface-based remote-sensing device"
                },
                "i": {
                  "label": "Submersible remote-sensing device"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "07": {
              "label": "Platform use category",
              "url": "https://www.loc.gov/marc/bibliographic/bd007r.html",
              "codes": {
                "a": {
                  "label": "Meteorological"
                },
                "b": {
                  "label": "Surface observing"
                },
                "c": {
                  "label": "Space observing"
                },
                "m": {
                  "label": "Mixed uses"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "08": {
              "label": "Sensor type",
              "url": "https://www.loc.gov/marc/bibliographic/bd007r.html",
              "codes": {
                "a": {
                  "label": "Active"
                },
                "b": {
                  "label": "Passive"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "09-10": {
              "label": "Data type",
              "url": "https://www.loc.gov/marc/bibliographic/bd007r.html",
              "codes": {
                "aa": {
                  "label": "Visible light"
                },
                "da": {
                  "label": "Near infrared"
                },
                "db": {
                  "label": "Middle infrared"
                },
                "dc": {
                  "label": "Far infrared"
                },
                "dd": {
                  "label": "Thermal infrared"
                },
                "de": {
                  "label": "Shortwave infrared (SWIR)"
                },
                "df": {
                  "label": "Reflective infrared"
                },
                "dv": {
                  "label": "Combinations"
                },
                "dz": {
                  "label": "Other infrared data"
                },
                "ga": {
                  "label": "Sidelooking airborne radar (SLAR)"
                },
                "gb": {
                  "label": "Synthetic aperture radar (SAR)-Single frequency"
                },
                "gc": {
                  "label": "SAR-multi-frequency (multichannel)"
                },
                "gd": {
                  "label": "SAR-like polarization"
                },
                "ge": {
                  "label": "SAR-cross polarization"
                },
                "gf": {
                  "label": "Infometric SAR"
                },
                "gg": {
                  "label": "polarmetric SAR"
                },
                "gu": {
                  "label": "Passive microwave mapping"
                },
                "gz": {
                  "label": "Other microwave data"
                },
                "ja": {
                  "label": "Far ultraviolet"
                },
                "jb": {
                  "label": "Middle ultraviolet"
                },
                "jc": {
                  "label": "Near ultraviolet"
                },
                "jv": {
                  "label": "Ultraviolet combinations"
                },
                "jz": {
                  "label": "Other ultraviolet data"
                },
                "ma": {
                  "label": "Multi-spectral, multidata"
                },
                "mb": {
                  "label": "Multi-temporal"
                },
                "mm": {
                  "label": "Combination of various data types"
                },
                "nn": {
                  "label": "Not applicable"
                },
                "pa": {
                  "label": "Sonar--water depth"
                },
                "pb": {
                  "label": "Sonar--bottom topography images, sidescan"
                },
                "pc": {
                  "label": "Sonar--bottom topography, near-surface"
                },
                "pd": {
                  "label": "Sonar--bottom topography, near-bottom"
                },
                "pe": {
                  "label": "Seismic surveys"
                },
                "pz": {
                  "label": "Other acoustical data"
                },
                "ra": {
                  "label": "Gravity anomalies (general)"
                },
                "rb": {
                  "label": "Free-air"
                },
                "rc": {
                  "label": "Bouger"
                },
                "rd": {
                  "label": "Isostatic"
                },
                "sa": {
                  "label": "Magnetic field"
                },
                "ta": {
                  "label": "radiometric surveys"
                },
                "uu": {
                  "label": "Unknown"
                },
                "zz": {
                  "label": "Other"
                },
                "||": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Sound recording": {
          "positions": {
            "00": {
              "label": "Category of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007s.html",
              "codes": {
                "s": {
                  "label": "Sound recording"
                }
              }
            },
            "01": {
              "label": "Specific material designation",
              "url": "https://www.loc.gov/marc/bibliographic/bd007s.html",
              "codes": {
                "d": {
                  "label": "Sound disc"
                },
                "e": {
                  "label": "Cylinder"
                },
                "g": {
                  "label": "Sound cartridge"
                },
                "i": {
                  "label": "Sound-track film"
                },
                "q": {
                  "label": "Roll"
                },
                "r": {
                  "label": "Remote"
                },
                "s": {
                  "label": "Sound cassette"
                },
                "t": {
                  "label": "Sound-tape reel"
                },
                "u": {
                  "label": "Unspecified"
                },
                "w": {
                  "label": "Wire recording"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "c": {
                  "label": "Cylinder [OBSOLETE]"
                },
                "f": {
                  "label": "Sound-track film [OBSOLETE]"
                },
                "r": {
                  "label": "Roll [OBSOLETE]"
                }
              }
            },
            "03": {
              "label": "Speed",
              "url": "https://www.loc.gov/marc/bibliographic/bd007s.html",
              "codes": {
                "a": {
                  "label": "16 rpm (discs)"
                },
                "b": {
                  "label": "33 1/3 rpm (discs)"
                },
                "c": {
                  "label": "45 rpm (discs)"
                },
                "d": {
                  "label": "78 rpm (discs)"
                },
                "e": {
                  "label": "8 rpm (discs)"
                },
                "f": {
                  "label": "1.4 m. per second (discs)"
                },
                "h": {
                  "label": "120 rpm (cylinders)"
                },
                "i": {
                  "label": "160 rpm (cylinders)"
                },
                "k": {
                  "label": "15/16 ips (tapes)"
                },
                "l": {
                  "label": "1 7/8 ips (tapes)"
                },
                "m": {
                  "label": "3 3/4 ips (tapes)"
                },
                "n": {
                  "label": "Not applicable"
                },
                "o": {
                  "label": "7 1/2 ips (tapes)"
                },
                "p": {
                  "label": "15 ips (tapes)"
                },
                "r": {
                  "label": "30 ips (tape)"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "04": {
              "label": "Configuration of playback channels",
              "url": "https://www.loc.gov/marc/bibliographic/bd007s.html",
              "codes": {
                "m": {
                  "label": "Monaural"
                },
                "q": {
                  "label": "Quadraphonic, multichannel, or surround"
                },
                "s": {
                  "label": "Stereophonic"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "a": {
                  "label": "Acoustic [OBSOLETE]"
                },
                "f": {
                  "label": "Monaural (digital) [OBSOLETE]"
                },
                "g": {
                  "label": "Quadraphonic (digital) [OBSOLETE]"
                },
                "j": {
                  "label": "Stereophonic (digital) [OBSOLETE]"
                },
                "k": {
                  "label": "Other (digital) [OBSOLETE]"
                },
                "o": {
                  "label": "Other (electric) [OBSOLETE]"
                }
              }
            },
            "05": {
              "label": "Groove width/groove pitch",
              "url": "https://www.loc.gov/marc/bibliographic/bd007s.html",
              "codes": {
                "m": {
                  "label": "Microgroove/fine"
                },
                "n": {
                  "label": "Not applicable"
                },
                "s": {
                  "label": "Coarse/standard"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "06": {
              "label": "Dimensions",
              "url": "https://www.loc.gov/marc/bibliographic/bd007s.html",
              "codes": {
                "a": {
                  "label": "3 in. diameter"
                },
                "b": {
                  "label": "5 in. diameter"
                },
                "c": {
                  "label": "7 in. diameter"
                },
                "d": {
                  "label": "10 in. diameter"
                },
                "e": {
                  "label": "12 in. diameter"
                },
                "f": {
                  "label": "16 in. diameter"
                },
                "g": {
                  "label": "4 3/4 in. or 12 cm. diameter"
                },
                "j": {
                  "label": "3 7/8 x 2 1/2 in."
                },
                "n": {
                  "label": "Not applicable"
                },
                "o": {
                  "label": "5 1/4 x 3 7/8 in."
                },
                "s": {
                  "label": "2 3/4 x 4 in."
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "07": {
              "label": "Tape width",
              "url": "https://www.loc.gov/marc/bibliographic/bd007s.html",
              "codes": {
                "l": {
                  "label": "1/8 in."
                },
                "m": {
                  "label": "1/4 in."
                },
                "n": {
                  "label": "Not applicable"
                },
                "o": {
                  "label": "1/2 in."
                },
                "p": {
                  "label": "1 in."
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "a": {
                  "label": "1/4 in. [OBSOLETE]"
                },
                "b": {
                  "label": "1/2 in. [OBSOLETE]"
                },
                "c": {
                  "label": "1 in. [OBSOLETE]"
                }
              }
            },
            "08": {
              "label": "Tape configuration",
              "url": "https://www.loc.gov/marc/bibliographic/bd007s.html",
              "codes": {
                "a": {
                  "label": "Full (1) track"
                },
                "b": {
                  "label": "Half (2) track"
                },
                "c": {
                  "label": "Quarter (4) track"
                },
                "d": {
                  "label": "Eight track"
                },
                "e": {
                  "label": "Twelve track"
                },
                "f": {
                  "label": "Sixteen track"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "09": {
              "label": "Kind of disc, cylinder, or tape",
              "url": "https://www.loc.gov/marc/bibliographic/bd007s.html",
              "codes": {
                "a": {
                  "label": "Master tape"
                },
                "b": {
                  "label": "Tape duplication master"
                },
                "d": {
                  "label": "Disc master (negative)"
                },
                "i": {
                  "label": "Instantaneous (recorded on the spot)"
                },
                "m": {
                  "label": "Mass-produced"
                },
                "n": {
                  "label": "Not applicable"
                },
                "r": {
                  "label": "Mother (positive)"
                },
                "s": {
                  "label": "Stamper (negative)"
                },
                "t": {
                  "label": "Test pressing"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "10": {
              "label": "Kind of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007s.html",
              "codes": {
                "a": {
                  "label": "Lacquer coating"
                },
                "b": {
                  "label": "Cellulose nitrate"
                },
                "c": {
                  "label": "Acetate tape with ferrous oxide"
                },
                "g": {
                  "label": "Glass with lacquer"
                },
                "i": {
                  "label": "Aluminum with lacquer"
                },
                "l": {
                  "label": "Metal"
                },
                "m": {
                  "label": "Plastic with metal"
                },
                "n": {
                  "label": "Not applicable"
                },
                "p": {
                  "label": "Plastic"
                },
                "r": {
                  "label": "Paper with lacquer or ferrous oxide"
                },
                "s": {
                  "label": "Shellac"
                },
                "w": {
                  "label": "Wax"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "11": {
              "label": "Kind of cutting",
              "url": "https://www.loc.gov/marc/bibliographic/bd007s.html",
              "codes": {
                "h": {
                  "label": "Hill-and-dale cutting"
                },
                "l": {
                  "label": "Lateral or combined cutting"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "12": {
              "label": "Special playback characteristics",
              "url": "https://www.loc.gov/marc/bibliographic/bd007s.html",
              "codes": {
                "a": {
                  "label": "NAB standard"
                },
                "b": {
                  "label": "CCIR standard"
                },
                "c": {
                  "label": "Dolby-B encoded"
                },
                "d": {
                  "label": "dbx encoded"
                },
                "e": {
                  "label": "Digital recording"
                },
                "f": {
                  "label": "Dolby-A encoded"
                },
                "g": {
                  "label": "Dolby-C encoded"
                },
                "h": {
                  "label": "CX encoded"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "13": {
              "label": "Capture and storage technique",
              "url": "https://www.loc.gov/marc/bibliographic/bd007s.html",
              "codes": {
                "a": {
                  "label": "Acoustical capture, direct storage"
                },
                "b": {
                  "label": "Direct storage, not acoustical"
                },
                "d": {
                  "label": "Digital storage"
                },
                "e": {
                  "label": "Analog electrical storage"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Text": {
          "positions": {
            "00": {
              "label": "Category of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007t.html",
              "codes": {
                "t": {
                  "label": "Text"
                }
              }
            },
            "01": {
              "label": "Specific material designation",
              "url": "https://www.loc.gov/marc/bibliographic/bd007t.html",
              "codes": {
                "a": {
                  "label": "Regular print"
                },
                "b": {
                  "label": "Large print"
                },
                "c": {
                  "label": "Braille"
                },
                "d": {
                  "label": "Loose-leaf"
                },
                "u": {
                  "label": "Unspecified"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Videorecording": {
          "positions": {
            "00": {
              "label": "Category of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007v.html",
              "codes": {
                "v": {
                  "label": "Videorecording"
                }
              }
            },
            "01": {
              "label": "Specific material designation",
              "url": "https://www.loc.gov/marc/bibliographic/bd007v.html",
              "codes": {
                "c": {
                  "label": "Videocartridge"
                },
                "d": {
                  "label": "Videodisc"
                },
                "f": {
                  "label": "Videocassette"
                },
                "r": {
                  "label": "Videoreel"
                },
                "u": {
                  "label": "Unspecified"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                " ": {
                  "label": "Not applicable or no attempt to code [OBSOLETE, 1980]"
                },
                "n": {
                  "label": "Not applicable [OBSOLETE, 1981]"
                }
              }
            },
            "03": {
              "label": "Color",
              "url": "https://www.loc.gov/marc/bibliographic/bd007v.html",
              "codes": {
                "a": {
                  "label": "One color"
                },
                "b": {
                  "label": "Black-and-white"
                },
                "c": {
                  "label": "Multicolored"
                },
                "m": {
                  "label": "Mixed"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "04": {
              "label": "Videorecording format",
              "url": "https://www.loc.gov/marc/bibliographic/bd007v.html",
              "codes": {
                "a": {
                  "label": "Beta (1/2 in., videocassette)"
                },
                "b": {
                  "label": "VHS (1/2 in., videocassette)"
                },
                "c": {
                  "label": "U-matic (3/4 in., videocasstte)"
                },
                "d": {
                  "label": "EIAJ (1/2 in., reel)"
                },
                "e": {
                  "label": "Type C (1 in., reel)"
                },
                "f": {
                  "label": "Quadruplex (1 in. or 2 in., reel)"
                },
                "g": {
                  "label": "Laserdisc"
                },
                "h": {
                  "label": "CED (Capacitance Electronic Disc) videodisc"
                },
                "i": {
                  "label": "Betacam (1/2 in., videocassette)"
                },
                "j": {
                  "label": "Betacam SP (1/2 in., videocassette)"
                },
                "k": {
                  "label": "Super-VHS (1/2 in., videocassette)"
                },
                "m": {
                  "label": "M-II (1/2 in., videocassette)"
                },
                "o": {
                  "label": "D-2 (3/4 in., videocassette)"
                },
                "p": {
                  "label": "8 mm."
                },
                "q": {
                  "label": "Hi-8 mm."
                },
                "s": {
                  "label": "Blu-ray disc"
                },
                "u": {
                  "label": "Unknown"
                },
                "v": {
                  "label": "DVD"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                " ": {
                  "label": "Not applicable or no attempt to code [OBSOLETE, 1980]"
                },
                "n": {
                  "label": "Not applicable [OBSOLETE, 1981]"
                }
              }
            },
            "05": {
              "label": "Sound on medium or separate",
              "url": "https://www.loc.gov/marc/bibliographic/bd007v.html",
              "codes": {
                " ": {
                  "label": "No sound (silent)"
                },
                "a": {
                  "label": "Sound on medium"
                },
                "b": {
                  "label": "Sound separate from medium"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "06": {
              "label": "Medium for sound",
              "url": "https://www.loc.gov/marc/bibliographic/bd007v.html",
              "codes": {
                " ": {
                  "label": "No sound (silent)"
                },
                "a": {
                  "label": "Optical sound track on motion picture film"
                },
                "b": {
                  "label": "Magnetic sound track on motion picture film"
                },
                "c": {
                  "label": "Magnetic audio tape in cartridge"
                },
                "d": {
                  "label": "Sound disc"
                },
                "e": {
                  "label": "Magnetic audio tape on reel"
                },
                "f": {
                  "label": "Magnetic audio tape in cassette"
                },
                "g": {
                  "label": "Optical and magnetic sound track on motion picture film"
                },
                "h": {
                  "label": "Videotape"
                },
                "i": {
                  "label": "Videodisc"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "g": {
                  "label": "Other [OBSOLETE, 1980]"
                }
              }
            },
            "07": {
              "label": "Dimensions",
              "url": "https://www.loc.gov/marc/bibliographic/bd007v.html",
              "codes": {
                "a": {
                  "label": "8 mm."
                },
                "m": {
                  "label": "1/4 in."
                },
                "o": {
                  "label": "1/2 in."
                },
                "p": {
                  "label": "1 in."
                },
                "q": {
                  "label": "2 in."
                },
                "r": {
                  "label": "3/4 in."
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "n": {
                  "label": "1/4 in. [OBSOLETE, 1981]"
                }
              }
            },
            "08": {
              "label": "Configuration of playback channels",
              "url": "https://www.loc.gov/marc/bibliographic/bd007v.html",
              "codes": {
                "k": {
                  "label": "Mixed"
                },
                "m": {
                  "label": "Monaural"
                },
                "n": {
                  "label": "Not applicable"
                },
                "q": {
                  "label": "Quadraphonic, multichannel, or surround"
                },
                "s": {
                  "label": "Stereophonic"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Unspecified": {
          "positions": {
            "00": {
              "label": "Category of material",
              "url": "https://www.loc.gov/marc/bibliographic/bd007z.html",
              "codes": {
                "z": {
                  "label": "Unspecified"
                }
              }
            },
            "01": {
              "label": "Specific material designation",
              "url": "https://www.loc.gov/marc/bibliographic/bd007z.html",
              "codes": {
                "m": {
                  "label": "Multiple physical forms"
                },
                "u": {
                  "label": "Unspecified"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        }
      }
    },
    "008": {
      "tag": "008",
      "label": "General Information",
      "repeatable": false,
      "types": {
        "All Materials": {
          "positions": {
            "00-05": {
              "label": "Date entered on file",
              "url": "https://www.loc.gov/marc/bibliographic/bd008a.html"
            },
            "06": {
              "label": "Type of date/Publication status",
              "url": "https://www.loc.gov/marc/bibliographic/bd008a.html",
              "codes": {
                "b": {
                  "label": "No dates given; B.C. date involved"
                },
                "c": {
                  "label": "Continuing resource currently published"
                },
                "d": {
                  "label": "Continuing resource ceased publication"
                },
                "e": {
                  "label": "Detailed date"
                },
                "i": {
                  "label": "Inclusive dates of collection"
                },
                "k": {
                  "label": "Range of years of bulk of collection"
                },
                "m": {
                  "label": "Multiple dates"
                },
                "n": {
                  "label": "Dates unknown"
                },
                "p": {
                  "label": "Date of distribution/release/issue and production/recording session when different"
                },
                "q": {
                  "label": "Questionable date"
                },
                "r": {
                  "label": "Reprint/reissue date and original date"
                },
                "s": {
                  "label": "Single known date/probable date"
                },
                "t": {
                  "label": "Publication date and copyright date"
                },
                "u": {
                  "label": "Continuing resource status unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "07-10": {
              "label": "Date 1",
              "url": "https://www.loc.gov/marc/bibliographic/bd008a.html"
            },
            "11-14": {
              "label": "Date 2",
              "url": "https://www.loc.gov/marc/bibliographic/bd008a.html"
            },
            "15-17": {
              "label": "Place of publication, production, or execution",
              "url": "https://www.loc.gov/marc/bibliographic/bd008a.html"
            },
            "35-37": {
              "label": "Language",
              "url": "https://www.loc.gov/marc/bibliographic/bd008a.html"
            },
            "38": {
              "label": "Modified record",
              "url": "https://www.loc.gov/marc/bibliographic/bd008a.html",
              "codes": {
                " ": {
                  "label": "Not modified"
                },
                "d": {
                  "label": "Dashed-on information omitted"
                },
                "o": {
                  "label": "Completely romanized/printed cards romanized"
                },
                "r": {
                  "label": "Completely romanized/printed cards in script"
                },
                "s": {
                  "label": "Shortened"
                },
                "x": {
                  "label": "Missing characters"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "u": {
                  "label": "Unknown [OBSOLETE] [CAN/MARC only]"
                }
              }
            },
            "39": {
              "label": "Cataloging source",
              "url": "https://www.loc.gov/marc/bibliographic/bd008a.html",
              "codes": {
                " ": {
                  "label": "National bibliographic agency"
                },
                "c": {
                  "label": "Cooperative cataloging program"
                },
                "d": {
                  "label": "Other"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "a": {
                  "label": "National Agricultural Library [OBSOLETE, 1997] [USMARC only]"
                },
                "b": {
                  "label": "National Library of Medicine [OBSOLETE, 1997] [USMARC only]"
                },
                "l": {
                  "label": "Library of Congress cataloguing [OBSOLETE, 1997] [CAN/MARC only]"
                },
                "o": {
                  "label": "Other institution cataloguing [OBSOLETE, 1997] [CAN/MARC only]"
                },
                "n": {
                  "label": "Report to New serials titles [OBSOLETE, 1997] [USMARC only]"
                },
                "r": {
                  "label": "Reporting library [OBSOLETE, 1997] [CAN/MARC only]"
                }
              }
            }
          }
        },
        "Books": {
          "positions": {
            "18-21": {
              "label": "Illustrations",
              "url": "https://www.loc.gov/marc/bibliographic/bd008b.html",
              "codes": {
                " ": {
                  "label": "No illustrations"
                },
                "a": {
                  "label": "Illustrations"
                },
                "b": {
                  "label": "Maps"
                },
                "c": {
                  "label": "Portraits"
                },
                "d": {
                  "label": "Charts"
                },
                "e": {
                  "label": "Plans"
                },
                "f": {
                  "label": "Plates"
                },
                "g": {
                  "label": "Music"
                },
                "h": {
                  "label": "Facsimiles"
                },
                "i": {
                  "label": "Coats of arms"
                },
                "j": {
                  "label": "Genealogical tables"
                },
                "k": {
                  "label": "Forms"
                },
                "l": {
                  "label": "Samples"
                },
                "m": {
                  "label": "Phonodisc, phonowire, etc."
                },
                "o": {
                  "label": "Photographs"
                },
                "p": {
                  "label": "Illuminations"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "22": {
              "label": "Target audience",
              "url": "https://www.loc.gov/marc/bibliographic/bd008b.html",
              "codes": {
                " ": {
                  "label": "Unknown or not specified"
                },
                "a": {
                  "label": "Preschool"
                },
                "b": {
                  "label": "Primary"
                },
                "c": {
                  "label": "Pre-adolescent"
                },
                "d": {
                  "label": "Adolescent"
                },
                "e": {
                  "label": "Adult"
                },
                "f": {
                  "label": "Specialized"
                },
                "g": {
                  "label": "General"
                },
                "j": {
                  "label": "Juvenile"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "u": {
                  "label": "School material at first level [OBSOLETE]"
                },
                "v": {
                  "label": "School material at second level [OBSOLETE]"
                }
              }
            },
            "23": {
              "label": "Form of item",
              "url": "https://www.loc.gov/marc/bibliographic/bd008b.html",
              "codes": {
                " ": {
                  "label": "None of the following"
                },
                "a": {
                  "label": "Microfilm"
                },
                "b": {
                  "label": "Microfiche"
                },
                "c": {
                  "label": "Microopaque"
                },
                "d": {
                  "label": "Large print"
                },
                "f": {
                  "label": "Braille"
                },
                "o": {
                  "label": "Online"
                },
                "q": {
                  "label": "Direct electronic"
                },
                "r": {
                  "label": "Regular print reproduction"
                },
                "s": {
                  "label": "Electronic"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "g": {
                  "label": "Punched paper tape [OBSOLETE, 1987]"
                },
                "h": {
                  "label": "Magnetic tape [OBSOLETE, 1987]"
                },
                "i": {
                  "label": "Multimedia [OBSOLETE, 1987]"
                },
                "z": {
                  "label": "Other form of reproduction [OBSOLETE, 1987]"
                }
              }
            },
            "24-27": {
              "label": "Nature of contents",
              "url": "https://www.loc.gov/marc/bibliographic/bd008b.html",
              "codes": {
                " ": {
                  "label": "No specified nature of contents"
                },
                "a": {
                  "label": "Abstracts/summaries"
                },
                "b": {
                  "label": "Bibliographies"
                },
                "c": {
                  "label": "Catalogs"
                },
                "d": {
                  "label": "Dictionaries"
                },
                "e": {
                  "label": "Encyclopedias"
                },
                "f": {
                  "label": "Handbooks"
                },
                "g": {
                  "label": "Legal articles"
                },
                "i": {
                  "label": "Indexes"
                },
                "j": {
                  "label": "Patent document"
                },
                "k": {
                  "label": "Discographies"
                },
                "l": {
                  "label": "Legislation"
                },
                "m": {
                  "label": "Theses"
                },
                "n": {
                  "label": "Surveys of literature in a subject area"
                },
                "o": {
                  "label": "Reviews"
                },
                "p": {
                  "label": "Programmed texts"
                },
                "q": {
                  "label": "Filmographies"
                },
                "r": {
                  "label": "Directories"
                },
                "s": {
                  "label": "Statistics"
                },
                "t": {
                  "label": "Technical reports"
                },
                "u": {
                  "label": "Standards/specifications"
                },
                "v": {
                  "label": "Legal cases and case notes"
                },
                "w": {
                  "label": "Law reports and digests"
                },
                "y": {
                  "label": "Yearbooks"
                },
                "z": {
                  "label": "Treaties"
                },
                "2": {
                  "label": "Offprints"
                },
                "5": {
                  "label": "Calendars"
                },
                "6": {
                  "label": "Comics/graphic novels"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "h": {
                  "label": "Handbooks [OBSOLETE]"
                },
                "x": {
                  "label": "Technical reports [OBSOLETE, 1997]"
                },
                "3": {
                  "label": "Discographies [OBSOLETE, 1997]"
                },
                "4": {
                  "label": "Filmographies [OBSOLETE, 1997]"
                }
              }
            },
            "28": {
              "label": "Government publication",
              "url": "https://www.loc.gov/marc/bibliographic/bd008b.html",
              "codes": {
                " ": {
                  "label": "Not a government publication"
                },
                "a": {
                  "label": "Autonomous or semi-autonomous component"
                },
                "c": {
                  "label": "Multilocal"
                },
                "f": {
                  "label": "Federal/national"
                },
                "i": {
                  "label": "International intergovernmental"
                },
                "l": {
                  "label": "Local"
                },
                "m": {
                  "label": "Multistate"
                },
                "o": {
                  "label": "Government publication-level undetermined"
                },
                "s": {
                  "label": "State, provincial, territorial, dependent, etc."
                },
                "u": {
                  "label": "Unknown if item is government publication"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "n": {
                  "label": "Government publication-level undetermined [OBSOLETE]"
                }
              }
            },
            "29": {
              "label": "Conference publication",
              "url": "https://www.loc.gov/marc/bibliographic/bd008b.html",
              "codes": {
                "0": {
                  "label": "Not a conference publication"
                },
                "1": {
                  "label": "Conference publication"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "30": {
              "label": "Festschrift",
              "url": "https://www.loc.gov/marc/bibliographic/bd008b.html",
              "codes": {
                "0": {
                  "label": "Not a festschrift"
                },
                "1": {
                  "label": "Festschrift"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "31": {
              "label": "Index",
              "url": "https://www.loc.gov/marc/bibliographic/bd008b.html",
              "codes": {
                "0": {
                  "label": "No index"
                },
                "1": {
                  "label": "Index present"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "33": {
              "label": "Literary form",
              "url": "https://www.loc.gov/marc/bibliographic/bd008b.html",
              "codes": {
                "0": {
                  "label": "Not fiction (not further specified)"
                },
                "1": {
                  "label": "Fiction (not further specified)"
                },
                "d": {
                  "label": "Dramas"
                },
                "e": {
                  "label": "Essays"
                },
                "f": {
                  "label": "Novels"
                },
                "h": {
                  "label": "Humor, satires, etc."
                },
                "i": {
                  "label": "Letters"
                },
                "j": {
                  "label": "Short stories"
                },
                "m": {
                  "label": "Mixed forms"
                },
                "p": {
                  "label": "Poetry"
                },
                "s": {
                  "label": "Speeches"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                " ": {
                  "label": "Non-fiction [OBSOLETE, 1997]"
                },
                "c": {
                  "label": "Comic strips [OBSOLETE, 2008]"
                }
              }
            },
            "34": {
              "label": "Biography",
              "url": "https://www.loc.gov/marc/bibliographic/bd008b.html",
              "codes": {
                " ": {
                  "label": "No biographical material"
                },
                "a": {
                  "label": "Autobiography"
                },
                "b": {
                  "label": "Individual biography"
                },
                "c": {
                  "label": "Collective biography"
                },
                "d": {
                  "label": "Contains biographical information"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Continuing Resources": {
          "positions": {
            "18": {
              "label": "Frequency",
              "url": "https://www.loc.gov/marc/bibliographic/bd008s.html",
              "codes": {
                " ": {
                  "label": "No determinable frequency"
                },
                "a": {
                  "label": "Annual"
                },
                "b": {
                  "label": "Bimonthly"
                },
                "c": {
                  "label": "Semiweekly"
                },
                "d": {
                  "label": "Daily"
                },
                "e": {
                  "label": "Biweekly"
                },
                "f": {
                  "label": "Semiannual"
                },
                "g": {
                  "label": "Biennial"
                },
                "h": {
                  "label": "Triennial"
                },
                "i": {
                  "label": "Three times a week"
                },
                "j": {
                  "label": "Three times a month"
                },
                "k": {
                  "label": "Continuously updated"
                },
                "m": {
                  "label": "Monthly"
                },
                "q": {
                  "label": "Quarterly"
                },
                "s": {
                  "label": "Semimonthly"
                },
                "t": {
                  "label": "Three times a year"
                },
                "u": {
                  "label": "Unknown"
                },
                "w": {
                  "label": "Weekly"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "19": {
              "label": "Regularity",
              "url": "https://www.loc.gov/marc/bibliographic/bd008s.html",
              "codes": {
                "n": {
                  "label": "Normalized irregular"
                },
                "r": {
                  "label": "Regular"
                },
                "u": {
                  "label": "Unknown"
                },
                "x": {
                  "label": "Completely irregular"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "21": {
              "label": "Type of continuing resource",
              "url": "https://www.loc.gov/marc/bibliographic/bd008s.html",
              "codes": {
                " ": {
                  "label": "None of the following"
                },
                "d": {
                  "label": "Updating database"
                },
                "l": {
                  "label": "Updating loose-leaf"
                },
                "m": {
                  "label": "Monographic series"
                },
                "n": {
                  "label": "Newspaper"
                },
                "p": {
                  "label": "Periodical"
                },
                "w": {
                  "label": "Updating Web site"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "22": {
              "label": "Form of original item",
              "url": "https://www.loc.gov/marc/bibliographic/bd008s.html",
              "codes": {
                " ": {
                  "label": "None of the following"
                },
                "a": {
                  "label": "Microfilm"
                },
                "b": {
                  "label": "Microfiche"
                },
                "c": {
                  "label": "Microopaque"
                },
                "d": {
                  "label": "Large print"
                },
                "e": {
                  "label": "Newspaper format"
                },
                "f": {
                  "label": "Braille"
                },
                "o": {
                  "label": "Online"
                },
                "q": {
                  "label": "Direct electronic"
                },
                "s": {
                  "label": "Electronic"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "23": {
              "label": "Form of item",
              "url": "https://www.loc.gov/marc/bibliographic/bd008s.html",
              "codes": {
                " ": {
                  "label": "None of the following"
                },
                "a": {
                  "label": "Microfilm"
                },
                "b": {
                  "label": "Microfiche"
                },
                "c": {
                  "label": "Microopaque"
                },
                "d": {
                  "label": "Large print"
                },
                "f": {
                  "label": "Braille"
                },
                "o": {
                  "label": "Online"
                },
                "q": {
                  "label": "Direct electronic"
                },
                "r": {
                  "label": "Regular print reproduction"
                },
                "s": {
                  "label": "Electronic"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "g": {
                  "label": "Punched paper tape [OBSOLETE, 1987]"
                },
                "h": {
                  "label": "Magnetic tape [OBSOLETE, 1987]"
                },
                "i": {
                  "label": "Multimedia [OBSOLETE, 1987]"
                },
                "z": {
                  "label": "Other [OBSOLETE, 1987]"
                }
              }
            },
            "24": {
              "label": "Nature of entire work",
              "url": "https://www.loc.gov/marc/bibliographic/bd008s.html",
              "codes": {
                " ": {
                  "label": "Not specified"
                },
                "a": {
                  "label": "Abstracts/summaries"
                },
                "b": {
                  "label": "Bibliographies"
                },
                "c": {
                  "label": "Catalogs"
                },
                "d": {
                  "label": "Dictionaries"
                },
                "e": {
                  "label": "Encyclopedias"
                },
                "f": {
                  "label": "Handbooks"
                },
                "g": {
                  "label": "Legal articles"
                },
                "h": {
                  "label": "Biography"
                },
                "i": {
                  "label": "Indexes"
                },
                "k": {
                  "label": "Discographies"
                },
                "l": {
                  "label": "Legislation"
                },
                "m": {
                  "label": "Theses"
                },
                "n": {
                  "label": "Surveys of literature in a subject area"
                },
                "o": {
                  "label": "Reviews"
                },
                "p": {
                  "label": "Programmed texts"
                },
                "q": {
                  "label": "Filmographies"
                },
                "r": {
                  "label": "Directories"
                },
                "s": {
                  "label": "Statistics"
                },
                "t": {
                  "label": "Technical reports"
                },
                "u": {
                  "label": "Standards/specifications"
                },
                "v": {
                  "label": "Legal cases and case notes"
                },
                "w": {
                  "label": "Law reports and digests"
                },
                "y": {
                  "label": "Yearbooks"
                },
                "z": {
                  "label": "Treaties"
                },
                "5": {
                  "label": "Calendars"
                },
                "6": {
                  "label": "Comics/graphic novels"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "3": {
                  "label": "Discographies [OBSOLETE, 1997]"
                },
                "4": {
                  "label": "Filmographies [OBSOLETE, 1997]"
                }
              }
            },
            "25-27": {
              "label": "Nature of contents",
              "url": "https://www.loc.gov/marc/bibliographic/bd008s.html",
              "codes": {
                " ": {
                  "label": "Not specified"
                },
                "a": {
                  "label": "Abstracts/summaries"
                },
                "b": {
                  "label": "Bibliographies"
                },
                "c": {
                  "label": "Catalogs"
                },
                "d": {
                  "label": "Dictionaries"
                },
                "e": {
                  "label": "Encyclopedias"
                },
                "f": {
                  "label": "Handbooks"
                },
                "g": {
                  "label": "Legal articles"
                },
                "h": {
                  "label": "Biography"
                },
                "i": {
                  "label": "Indexes"
                },
                "k": {
                  "label": "Discographies"
                },
                "l": {
                  "label": "Legislation"
                },
                "m": {
                  "label": "Theses"
                },
                "n": {
                  "label": "Surveys of literature in a subject area"
                },
                "o": {
                  "label": "Reviews"
                },
                "p": {
                  "label": "Programmed texts"
                },
                "q": {
                  "label": "Filmographies"
                },
                "r": {
                  "label": "Directories"
                },
                "s": {
                  "label": "Statistics"
                },
                "t": {
                  "label": "Technical reports"
                },
                "u": {
                  "label": "Standards/specifications"
                },
                "v": {
                  "label": "Legal cases and case notes"
                },
                "w": {
                  "label": "Law reports and digests"
                },
                "y": {
                  "label": "Yearbooks"
                },
                "z": {
                  "label": "Treaties"
                },
                "5": {
                  "label": "Calendars"
                },
                "6": {
                  "label": "Comics/graphic novels"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "3": {
                  "label": "Discographies [OBSOLETE, 1997]"
                },
                "4": {
                  "label": "Filmographies [OBSOLETE, 1997]"
                }
              }
            },
            "28": {
              "label": "Government publication",
              "url": "https://www.loc.gov/marc/bibliographic/bd008s.html",
              "codes": {
                " ": {
                  "label": "Not a government publication"
                },
                "a": {
                  "label": "Autonomous or semi-autonomous component"
                },
                "c": {
                  "label": "Multilocal"
                },
                "f": {
                  "label": "Federal/national"
                },
                "i": {
                  "label": "International intergovernmental"
                },
                "l": {
                  "label": "Local"
                },
                "m": {
                  "label": "Multistate"
                },
                "o": {
                  "label": "Government publication-level undetermined"
                },
                "s": {
                  "label": "State, provincial, territorial, dependent, etc."
                },
                "u": {
                  "label": "Unknown if item is government publication"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "n": {
                  "label": "Government publication-level undetermined [OBSOLETE, 1979]"
                }
              }
            },
            "29": {
              "label": "Conference publication",
              "url": "https://www.loc.gov/marc/bibliographic/bd008s.html",
              "codes": {
                "0": {
                  "label": "Not a conference publication"
                },
                "1": {
                  "label": "Conference publication"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "33": {
              "label": "Original alphabet or script of title",
              "url": "https://www.loc.gov/marc/bibliographic/bd008s.html",
              "codes": {
                " ": {
                  "label": "No alphabet or script given/No key title"
                },
                "a": {
                  "label": "Basic Roman"
                },
                "b": {
                  "label": "Extended Roman"
                },
                "c": {
                  "label": "Cyrillic"
                },
                "d": {
                  "label": "Japanese"
                },
                "e": {
                  "label": "Chinese"
                },
                "f": {
                  "label": "Arabic"
                },
                "g": {
                  "label": "Greek"
                },
                "h": {
                  "label": "Hebrew"
                },
                "i": {
                  "label": "Thai"
                },
                "j": {
                  "label": "Devanagari"
                },
                "k": {
                  "label": "Korean"
                },
                "l": {
                  "label": "Tamil"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "34": {
              "label": "Entry convention",
              "url": "https://www.loc.gov/marc/bibliographic/bd008s.html",
              "codes": {
                "0": {
                  "label": "Successive entry"
                },
                "1": {
                  "label": "Latest entry"
                },
                "2": {
                  "label": "Integrated entry"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Music": {
          "positions": {
            "18-19": {
              "label": "Form of composition",
              "url": "https://www.loc.gov/marc/bibliographic/bd008m.html",
              "codes": {
                "an": {
                  "label": "Anthems"
                },
                "bd": {
                  "label": "Ballads"
                },
                "bg": {
                  "label": "Bluegrass music"
                },
                "bl": {
                  "label": "Blues"
                },
                "bt": {
                  "label": "Ballets"
                },
                "ca": {
                  "label": "Chaconnes"
                },
                "cb": {
                  "label": "Chants, Other religions"
                },
                "cc": {
                  "label": "Chant, Christian"
                },
                "cg": {
                  "label": "Concerti grossi"
                },
                "ch": {
                  "label": "Chorales"
                },
                "cl": {
                  "label": "Chorale preludes"
                },
                "cn": {
                  "label": "Canons and rounds"
                },
                "co": {
                  "label": "Concertos"
                },
                "cp": {
                  "label": "Chansons, polyphonic"
                },
                "cr": {
                  "label": "Carols"
                },
                "cs": {
                  "label": "Chance compositions"
                },
                "ct": {
                  "label": "Cantatas"
                },
                "cy": {
                  "label": "Country music"
                },
                "cz": {
                  "label": "Canzonas"
                },
                "df": {
                  "label": "Dance forms"
                },
                "dv": {
                  "label": "Divertimentos, serenades, cassations, divertissements, and notturni"
                },
                "fg": {
                  "label": "Fugues"
                },
                "fl": {
                  "label": "Flamenco"
                },
                "fm": {
                  "label": "Folk music"
                },
                "ft": {
                  "label": "Fantasias"
                },
                "gm": {
                  "label": "Gospel music"
                },
                "hy": {
                  "label": "Hymns"
                },
                "jz": {
                  "label": "Jazz"
                },
                "mc": {
                  "label": "Musical revues and comedies"
                },
                "md": {
                  "label": "Madrigals"
                },
                "mi": {
                  "label": "Minuets"
                },
                "mo": {
                  "label": "Motets"
                },
                "mp": {
                  "label": "Motion picture music"
                },
                "mr": {
                  "label": "Marches"
                },
                "ms": {
                  "label": "Masses"
                },
                "mu": {
                  "label": "Multiple forms"
                },
                "mz": {
                  "label": "Mazurkas"
                },
                "nc": {
                  "label": "Nocturnes"
                },
                "nn": {
                  "label": "Not applicable"
                },
                "op": {
                  "label": "Operas"
                },
                "or": {
                  "label": "Oratorios"
                },
                "ov": {
                  "label": "Overtures"
                },
                "pg": {
                  "label": "Program music"
                },
                "pm": {
                  "label": "Passion music"
                },
                "po": {
                  "label": "Polonaises"
                },
                "pp": {
                  "label": "Popular music"
                },
                "pr": {
                  "label": "Preludes"
                },
                "ps": {
                  "label": "Passacaglias"
                },
                "pt": {
                  "label": "Part-songs"
                },
                "pv": {
                  "label": "Pavans"
                },
                "rc": {
                  "label": "Rock music"
                },
                "rd": {
                  "label": "Rondos"
                },
                "rg": {
                  "label": "Ragtime music"
                },
                "ri": {
                  "label": "Ricercars"
                },
                "rp": {
                  "label": "Rhapsodies"
                },
                "rq": {
                  "label": "Requiems"
                },
                "sd": {
                  "label": "Square dance music"
                },
                "sg": {
                  "label": "Songs"
                },
                "sn": {
                  "label": "Sonatas"
                },
                "sp": {
                  "label": "Symphonic poems"
                },
                "st": {
                  "label": "Studies and exercises"
                },
                "su": {
                  "label": "Suites"
                },
                "sy": {
                  "label": "Symphonies"
                },
                "tc": {
                  "label": "Toccatas"
                },
                "tl": {
                  "label": "Teatro lirico"
                },
                "ts": {
                  "label": "Trio-sonatas"
                },
                "uu": {
                  "label": "Unknown"
                },
                "vi": {
                  "label": "Villancicos"
                },
                "vr": {
                  "label": "Variations"
                },
                "wz": {
                  "label": "Waltzes"
                },
                "za": {
                  "label": "Zarzuelas"
                },
                "zz": {
                  "label": "Other"
                },
                "||": {
                  "label": "No attempt to code"
                }
              }
            },
            "20": {
              "label": "Format of music",
              "url": "https://www.loc.gov/marc/bibliographic/bd008m.html",
              "codes": {
                "a": {
                  "label": "Full score"
                },
                "b": {
                  "label": "Miniature or study score"
                },
                "c": {
                  "label": "Accompaniment reduced for keyboard"
                },
                "d": {
                  "label": "Voice score with accompaniment omitted"
                },
                "e": {
                  "label": "Condensed score or piano-conductor score"
                },
                "g": {
                  "label": "Close score"
                },
                "h": {
                  "label": "Chorus score"
                },
                "i": {
                  "label": "Condensed score"
                },
                "j": {
                  "label": "Performer-conductor part"
                },
                "k": {
                  "label": "Vocal score"
                },
                "l": {
                  "label": "Score"
                },
                "m": {
                  "label": "Multiple score formats"
                },
                "n": {
                  "label": "Not applicable"
                },
                "p": {
                  "label": "Piano score"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "21": {
              "label": "Music parts",
              "url": "https://www.loc.gov/marc/bibliographic/bd008m.html",
              "codes": {
                " ": {
                  "label": "No parts in hand or not specified"
                },
                "d": {
                  "label": "Instrumental and vocal parts"
                },
                "e": {
                  "label": "Instrumental parts"
                },
                "f": {
                  "label": "Vocal parts"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "a": {
                  "label": "Parts exist"
                }
              }
            },
            "22": {
              "label": "Target audience",
              "url": "https://www.loc.gov/marc/bibliographic/bd008m.html",
              "codes": {
                " ": {
                  "label": "Unknown or unspecified"
                },
                "a": {
                  "label": "Preschool"
                },
                "b": {
                  "label": "Primary"
                },
                "c": {
                  "label": "Pre-adolescent"
                },
                "d": {
                  "label": "Adolescent"
                },
                "e": {
                  "label": "Adult"
                },
                "f": {
                  "label": "Specialized"
                },
                "g": {
                  "label": "General"
                },
                "j": {
                  "label": "Juvenile"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "u": {
                  "label": "School material at first level [OBSOLETE] [CAN/MARC only]"
                },
                "v": {
                  "label": "School material at second level [OBSOLETE] [CAN/MARC only]"
                }
              }
            },
            "23": {
              "label": "Form of item",
              "url": "https://www.loc.gov/marc/bibliographic/bd008m.html",
              "codes": {
                " ": {
                  "label": "None of the following"
                },
                "a": {
                  "label": "Microfilm"
                },
                "b": {
                  "label": "Microfiche"
                },
                "c": {
                  "label": "Microopaque"
                },
                "d": {
                  "label": "Large print"
                },
                "f": {
                  "label": "Braille"
                },
                "o": {
                  "label": "Online"
                },
                "q": {
                  "label": "Direct electronic"
                },
                "r": {
                  "label": "Regular print reproduction"
                },
                "s": {
                  "label": "Electronic"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "g": {
                  "label": "Punched paper tape [OBSOLETE, 1987]"
                },
                "h": {
                  "label": "Magnetic tape [OBSOLETE, 1987]"
                },
                "i": {
                  "label": "Multimedia [OBSOLETE, 1987]"
                },
                "x": {
                  "label": "Other form of reproduction [OBSOLETE] [USMARC only]"
                },
                "z": {
                  "label": "Other form of reproduction [OBSOLETE]"
                }
              }
            },
            "24-29": {
              "label": "Accompanying matter",
              "url": "https://www.loc.gov/marc/bibliographic/bd008m.html",
              "codes": {
                " ": {
                  "label": "No accompanying matter"
                },
                "a": {
                  "label": "Discography"
                },
                "b": {
                  "label": "Bibliography"
                },
                "c": {
                  "label": "Thematic index"
                },
                "d": {
                  "label": "Libretto or text"
                },
                "e": {
                  "label": "Biography of composer or author"
                },
                "f": {
                  "label": "Biography of performer or history of ensemble"
                },
                "g": {
                  "label": "Technical and/or historical information on instruments"
                },
                "h": {
                  "label": "Technical information on music"
                },
                "i": {
                  "label": "Historical information"
                },
                "k": {
                  "label": "Ethnological information"
                },
                "r": {
                  "label": "Instructional materials"
                },
                "s": {
                  "label": "Music"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "g": {
                  "label": "Punched paper tape [OBSOLETE, 1987]"
                },
                "n": {
                  "label": "Not applicable [OBSOLETE, 1980]"
                },
                "j": {
                  "label": "Historical information other than music [OBSOLETE, 1980]"
                },
                "l": {
                  "label": "Biography of arranger or transcriber [OBSOLETE, 1997]"
                }
              }
            },
            "30-31": {
              "label": "Literary text for sound recordings",
              "url": "https://www.loc.gov/marc/bibliographic/bd008m.html",
              "codes": {
                " ": {
                  "label": "Item is a music sound recording"
                },
                "a": {
                  "label": "Autobiography"
                },
                "b": {
                  "label": "Biography"
                },
                "c": {
                  "label": "Conference proceedings"
                },
                "d": {
                  "label": "Drama"
                },
                "e": {
                  "label": "Essays"
                },
                "f": {
                  "label": "Fiction"
                },
                "g": {
                  "label": "Reporting"
                },
                "h": {
                  "label": "History"
                },
                "i": {
                  "label": "Instruction"
                },
                "j": {
                  "label": "Language instruction"
                },
                "k": {
                  "label": "Comedy"
                },
                "l": {
                  "label": "Lectures, speeches"
                },
                "m": {
                  "label": "Memoirs"
                },
                "n": {
                  "label": "Not applicable"
                },
                "o": {
                  "label": "Folktales"
                },
                "p": {
                  "label": "Poetry"
                },
                "r": {
                  "label": "Rehearsals"
                },
                "s": {
                  "label": "Sounds"
                },
                "t": {
                  "label": "Interviews"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "33": {
              "label": "Transposition and arrangement",
              "url": "https://www.loc.gov/marc/bibliographic/bd008m.html",
              "codes": {
                " ": {
                  "label": "Not arrangement or transposition or not specified"
                },
                "a": {
                  "label": "Transposition"
                },
                "b": {
                  "label": "Arrangement"
                },
                "c": {
                  "label": "Both transposed and arranged"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Maps": {
          "positions": {
            "18-21": {
              "label": "Relief",
              "url": "https://www.loc.gov/marc/bibliographic/bd008p.html",
              "codes": {
                " ": {
                  "label": "No relief shown"
                },
                "a": {
                  "label": "Contours"
                },
                "b": {
                  "label": "Shading"
                },
                "c": {
                  "label": "Gradient and bathymetric tints"
                },
                "d": {
                  "label": "Hachures"
                },
                "e": {
                  "label": "Bathymetry/soundings"
                },
                "f": {
                  "label": "Form lines"
                },
                "g": {
                  "label": "Spot heights"
                },
                "i": {
                  "label": "Pictorially"
                },
                "j": {
                  "label": "Land forms"
                },
                "k": {
                  "label": "Bathymetry/isolines"
                },
                "m": {
                  "label": "Rock drawings"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "h": {
                  "label": "Color [OBSOLETE, 1980]"
                }
              }
            },
            "22-23": {
              "label": "Projection",
              "url": "https://www.loc.gov/marc/bibliographic/bd008p.html",
              "codes": {
                "  ": {
                  "label": "Projection not specified"
                },
                "aa": {
                  "label": "Aitoff"
                },
                "ab": {
                  "label": "Gnomic"
                },
                "ac": {
                  "label": "Lambert's azimuthal equal area"
                },
                "ad": {
                  "label": "Orthographic"
                },
                "ae": {
                  "label": "Azimuthal equidistant"
                },
                "af": {
                  "label": "Stereographic"
                },
                "ag": {
                  "label": "General vertical near-sided"
                },
                "am": {
                  "label": "Modified stereographic for Alaska"
                },
                "an": {
                  "label": "Chamberlin trimetric"
                },
                "ap": {
                  "label": "Polar stereographic"
                },
                "au": {
                  "label": "Azimuthal, specific type unknown"
                },
                "az": {
                  "label": "Azimuthal, other"
                },
                "ba": {
                  "label": "Gall"
                },
                "bb": {
                  "label": "Goode's homolographic"
                },
                "bc": {
                  "label": "Lambert's cylindrical equal area"
                },
                "bd": {
                  "label": "Mercator"
                },
                "be": {
                  "label": "Miller"
                },
                "bf": {
                  "label": "Mollweide"
                },
                "bg": {
                  "label": "Sinusoidal"
                },
                "bh": {
                  "label": "Transverse Mercator"
                },
                "bi": {
                  "label": "Gauss-Kruger"
                },
                "bj": {
                  "label": "Equirectangular"
                },
                "bk": {
                  "label": "Krovak"
                },
                "bl": {
                  "label": "Cassini-Soldner"
                },
                "bo": {
                  "label": "Oblique Mercator"
                },
                "br": {
                  "label": "Robinson"
                },
                "bs": {
                  "label": "Space oblique Mercator"
                },
                "bu": {
                  "label": "Cylindrical, specific type unknown"
                },
                "bz": {
                  "label": "Cylindrical, other"
                },
                "ca": {
                  "label": "Albers equal area"
                },
                "cb": {
                  "label": "Bonne"
                },
                "cc": {
                  "label": "Lambert's conformal conic"
                },
                "ce": {
                  "label": "Equidistant conic"
                },
                "cp": {
                  "label": "Polyconic"
                },
                "cu": {
                  "label": "Conic, specific type unknown"
                },
                "cz": {
                  "label": "Conic, other"
                },
                "da": {
                  "label": "Armadillo"
                },
                "db": {
                  "label": "Butterfly"
                },
                "dc": {
                  "label": "Eckert"
                },
                "dd": {
                  "label": "Goode's homolosine"
                },
                "de": {
                  "label": "Miller's bipolar oblique conformal conic"
                },
                "df": {
                  "label": "Van Der Grinten"
                },
                "dg": {
                  "label": "Dimaxion"
                },
                "dh": {
                  "label": "Cordiform"
                },
                "dl": {
                  "label": "Lambert conformal"
                },
                "zz": {
                  "label": "Other"
                },
                "||": {
                  "label": "No attempt to code"
                }
              }
            },
            "25": {
              "label": "Type of cartographic material",
              "url": "https://www.loc.gov/marc/bibliographic/bd008p.html",
              "codes": {
                "a": {
                  "label": "Single map"
                },
                "b": {
                  "label": "Map series"
                },
                "c": {
                  "label": "Map serial"
                },
                "d": {
                  "label": "Globe"
                },
                "e": {
                  "label": "Atlas"
                },
                "f": {
                  "label": "Separate supplement to another work"
                },
                "g": {
                  "label": "Bound as part of another work"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "28": {
              "label": "Government publication",
              "url": "https://www.loc.gov/marc/bibliographic/bd008p.html",
              "codes": {
                " ": {
                  "label": "Not a government publication"
                },
                "a": {
                  "label": "Autonomous or semi-autonomous component"
                },
                "c": {
                  "label": "Multilocal"
                },
                "f": {
                  "label": "Federal/national"
                },
                "i": {
                  "label": "International intergovernmental"
                },
                "l": {
                  "label": "Local"
                },
                "m": {
                  "label": "Multistate"
                },
                "o": {
                  "label": "Government publication-level undetermined"
                },
                "s": {
                  "label": "State, provincial, territorial, dependent, etc."
                },
                "u": {
                  "label": "Unknown if item is government publication"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "29": {
              "label": "Form of item",
              "url": "https://www.loc.gov/marc/bibliographic/bd008p.html",
              "codes": {
                " ": {
                  "label": "None of the following"
                },
                "a": {
                  "label": "Microfilm"
                },
                "b": {
                  "label": "Microfiche"
                },
                "c": {
                  "label": "Microopaque"
                },
                "d": {
                  "label": "Large print"
                },
                "f": {
                  "label": "Braille"
                },
                "o": {
                  "label": "Online"
                },
                "q": {
                  "label": "Direct electronic"
                },
                "r": {
                  "label": "Regular print reproduction"
                },
                "s": {
                  "label": "Electronic"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "31": {
              "label": "Index",
              "url": "https://www.loc.gov/marc/bibliographic/bd008p.html",
              "codes": {
                "0": {
                  "label": "No index"
                },
                "1": {
                  "label": "Index present"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "33-34": {
              "label": "Special format characteristics",
              "url": "https://www.loc.gov/marc/bibliographic/bd008p.html",
              "codes": {
                " ": {
                  "label": "No specified special format characteristics"
                },
                "e": {
                  "label": "Manuscript"
                },
                "j": {
                  "label": "Picture card, post card"
                },
                "k": {
                  "label": "Calendar"
                },
                "l": {
                  "label": "Puzzle"
                },
                "n": {
                  "label": "Game"
                },
                "o": {
                  "label": "Wall map"
                },
                "p": {
                  "label": "Playing cards"
                },
                "r": {
                  "label": "Loose-leaf"
                },
                "z": {
                  "label": "Other"
                },
                "||": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "a": {
                  "label": "Photocopy, blue line print [OBSOLETE, 1982]"
                },
                "b": {
                  "label": "Photocopy [OBSOLETE, 1982]"
                },
                "c": {
                  "label": "Negative photocopy [OBSOLETE, 1982]"
                },
                "d": {
                  "label": "Film negative [OBSOLETE, 1982]"
                },
                "f": {
                  "label": "Facsimile [OBSOLETE, 1982]"
                },
                "g": {
                  "label": "Relief model [OBSOLETE, 1982]"
                },
                "h": {
                  "label": "Rare [OBSOLETE, 1982]"
                },
                "m": {
                  "label": "Braille [OBSOLETE, 1998]"
                },
                "q": {
                  "label": "Large print [OBSOLETE, 1998]"
                }
              }
            }
          }
        },
        "Visual Materials": {
          "positions": {
            "18-20": {
              "label": "Running time for motion pictures and videorecordings",
              "url": "https://www.loc.gov/marc/bibliographic/bd008v.html",
              "codes": {
                "000": {
                  "label": "Running time exceeds three characters"
                },
                "001-999": {
                  "label": "Running time"
                },
                "nnn": {
                  "label": "Not applicable"
                },
                "---": {
                  "label": "Unknown"
                },
                "|||": {
                  "label": "No attempt to code"
                }
              }
            },
            "22": {
              "label": "Target audience",
              "url": "https://www.loc.gov/marc/bibliographic/bd008v.html",
              "codes": {
                " ": {
                  "label": "Unknown or not specified"
                },
                "a": {
                  "label": "Preschool"
                },
                "b": {
                  "label": "Primary"
                },
                "c": {
                  "label": "Pre-adolescent"
                },
                "d": {
                  "label": "Adolescent"
                },
                "e": {
                  "label": "Adult"
                },
                "f": {
                  "label": "Specialized"
                },
                "g": {
                  "label": "General"
                },
                "j": {
                  "label": "Juvenile"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "f": {
                  "label": "General [OBSOLETE]"
                },
                "g": {
                  "label": "Specialized [OBSOLETE]"
                },
                "h": {
                  "label": "Secondary (grades 10-12) [OBSOLETE] [CAN/MARC only]"
                },
                "k": {
                  "label": "Preschool and Kindergarten [OBSOLETE] [CAN/MARC only]"
                },
                "m": {
                  "label": "Primary (grades 4-6) [OBSOLETE] [CAN/MARC only]"
                },
                "p": {
                  "label": "Special education - general [OBSOLETE] [CAN/MARC only]"
                },
                "q": {
                  "label": "Physically handicapped [OBSOLETE] [CAN/MARC only]"
                },
                "r": {
                  "label": "Mentally retarded [OBSOLETE] [CAN/MARC only]"
                },
                "s": {
                  "label": "Simplified works for adults [OBSOLETE] [CAN/MARC only]"
                },
                "t": {
                  "label": "Gifted [OBSOLETE] [CAN/MARC only]"
                }
              }
            },
            "28": {
              "label": "Government publication",
              "url": "https://www.loc.gov/marc/bibliographic/bd008v.html",
              "codes": {
                " ": {
                  "label": "Not a government publication"
                },
                "a": {
                  "label": "Autonomous or semi-autonomous component"
                },
                "c": {
                  "label": "Multilocal"
                },
                "f": {
                  "label": "Federal/national"
                },
                "i": {
                  "label": "International intergovernmental"
                },
                "l": {
                  "label": "Local"
                },
                "m": {
                  "label": "Multistate"
                },
                "o": {
                  "label": "Government publication-level undetermined"
                },
                "s": {
                  "label": "State, provincial, territorial, dependent, etc."
                },
                "u": {
                  "label": "Unknown if item is government publication"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "n": {
                  "label": "Government publication-level undetermined [OBSOLETE, 1979]"
                }
              }
            },
            "29": {
              "label": "Form of item",
              "url": "https://www.loc.gov/marc/bibliographic/bd008v.html",
              "codes": {
                " ": {
                  "label": "None of the following"
                },
                "a": {
                  "label": "Microfilm"
                },
                "b": {
                  "label": "Microfiche"
                },
                "c": {
                  "label": "Microopaque"
                },
                "d": {
                  "label": "Large print"
                },
                "f": {
                  "label": "Braille"
                },
                "o": {
                  "label": "Online"
                },
                "q": {
                  "label": "Direct electronic"
                },
                "r": {
                  "label": "Regular print reproduction"
                },
                "s": {
                  "label": "Electronic"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "33": {
              "label": "Type of visual material",
              "url": "https://www.loc.gov/marc/bibliographic/bd008v.html",
              "codes": {
                "a": {
                  "label": "Art original"
                },
                "b": {
                  "label": "Kit"
                },
                "c": {
                  "label": "Art reproduction"
                },
                "d": {
                  "label": "Diorama"
                },
                "f": {
                  "label": "Filmstrip"
                },
                "g": {
                  "label": "Game"
                },
                "i": {
                  "label": "Picture"
                },
                "k": {
                  "label": "Graphic"
                },
                "l": {
                  "label": "Technical drawing"
                },
                "m": {
                  "label": "Motion picture"
                },
                "n": {
                  "label": "Chart"
                },
                "o": {
                  "label": "Flash card"
                },
                "p": {
                  "label": "Microscope slide"
                },
                "q": {
                  "label": "Model"
                },
                "r": {
                  "label": "Realia"
                },
                "s": {
                  "label": "Slide"
                },
                "t": {
                  "label": "Transparency"
                },
                "v": {
                  "label": "Videorecording"
                },
                "w": {
                  "label": "Toy"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "e": {
                  "label": "Electronic videorecording [OBSOLETE, 1975]"
                }
              }
            },
            "34": {
              "label": "Technique",
              "url": "https://www.loc.gov/marc/bibliographic/bd008v.html",
              "codes": {
                "a": {
                  "label": "Animation"
                },
                "c": {
                  "label": "Animation and live action"
                },
                "l": {
                  "label": "Live action"
                },
                "n": {
                  "label": "Not applicable"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                " ": {
                  "label": "Not applicable [OBSOLETE, 1980]"
                }
              }
            }
          }
        },
        "Computer Files": {
          "positions": {
            "22": {
              "label": "Target audience",
              "url": "https://www.loc.gov/marc/bibliographic/bd008c.html",
              "codes": {
                " ": {
                  "label": "Unknown or not specified"
                },
                "a": {
                  "label": "Preschool"
                },
                "b": {
                  "label": "Primary"
                },
                "c": {
                  "label": "Pre-adolescent"
                },
                "d": {
                  "label": "Adolescent"
                },
                "e": {
                  "label": "Adult"
                },
                "f": {
                  "label": "Specialized"
                },
                "g": {
                  "label": "General"
                },
                "j": {
                  "label": "Juvenile"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "23": {
              "label": "Form of item",
              "url": "https://www.loc.gov/marc/bibliographic/bd008c.html",
              "codes": {
                " ": {
                  "label": "Unknown or not specified"
                },
                "o": {
                  "label": "Online"
                },
                "q": {
                  "label": "Direct electronic"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "26": {
              "label": "Type of computer file",
              "url": "https://www.loc.gov/marc/bibliographic/bd008c.html",
              "codes": {
                "a": {
                  "label": "Numeric data"
                },
                "b": {
                  "label": "Computer program"
                },
                "c": {
                  "label": "Representational"
                },
                "d": {
                  "label": "Document"
                },
                "e": {
                  "label": "Bibliographic data"
                },
                "f": {
                  "label": "Font"
                },
                "g": {
                  "label": "Game"
                },
                "h": {
                  "label": "Sound"
                },
                "i": {
                  "label": "Interactive multimedia"
                },
                "j": {
                  "label": "Online system or service"
                },
                "m": {
                  "label": "Combination"
                },
                "u": {
                  "label": "Unknown"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            },
            "28": {
              "label": "Government publication",
              "url": "https://www.loc.gov/marc/bibliographic/bd008c.html",
              "codes": {
                " ": {
                  "label": "Not a government publication"
                },
                "a": {
                  "label": "Autonomous or semi-autonomous component"
                },
                "c": {
                  "label": "Multilocal"
                },
                "f": {
                  "label": "Federal/national"
                },
                "i": {
                  "label": "International intergovernmental"
                },
                "l": {
                  "label": "Local"
                },
                "m": {
                  "label": "Multistate"
                },
                "o": {
                  "label": "Government publication-level undetermined"
                },
                "s": {
                  "label": "State, provincial, territorial, dependent, etc."
                },
                "u": {
                  "label": "Unknown if item is government publication"
                },
                "z": {
                  "label": "Other"
                },
                "|": {
                  "label": "No attempt to code"
                }
              }
            }
          }
        },
        "Mixed Materials": {
          "positions": {
            "23": {
              "label": "Form of item",
              "url": "https://www.loc.gov/marc/bibliographic/bd008x.html",
              "codes": {
                " ": {
                  "label": "None of the following"
                },
                "a": {
                  "label": "Microfilm"
                },
                "b": {
                  "label": "Microfiche"
                },
                "c": {
                  "label": "Microopaque"
                },
                "d": {
                  "label": "Large print"
                },
                "f": {
                  "label": "Braille"
                },
                "o": {
                  "label": "Online"
                },
                "q": {
                  "label": "Direct electronic"
                },
                "r": {
                  "label": "Regular print reproduction"
                },
                "s": {
                  "label": "Electronic"
                },
                "|": {
                  "label": "No attempt to code"
                }
              },
              "historical-codes": {
                "g": {
                  "label": "Punched paper tape [OBSOLETE, 1987]"
                },
                "h": {
                  "label": "Magnetic tape [OBSOLETE, 1987]"
                },
                "i": {
                  "label": "Multimedia [OBSOLETE, 1987]"
                },
                "j": {
                  "label": "Handwritten transcript [OBSOLETE, 1987]"
                },
                "p": {
                  "label": "Photocopy [OBSOLETE, 1987]"
                },
                "t": {
                  "label": "Typewritten transcript [OBSOLETE, 1987]"
                },
                "z": {
                  "label": "Other form of reproduction [OBSOLETE, 1987]"
                }
              }
            }
          }
        }
      }
    },
    "010": {
      "tag": "010",
      "label": "Library of Congress Control Number",
      "url": "https://www.loc.gov/marc/bibliographic/bd010.html",
      "repeatable": false,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "LC control number",
          "repeatable": false
        },
        "b": {
          "label": "NUCMC control number",
          "repeatable": true
        },
        "z": {
          "label": "Canceled/invalid LC control number",
          "repeatable": true
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "013": {
      "tag": "013",
      "label": "Patent Control Information",
      "url": "https://www.loc.gov/marc/bibliographic/bd013.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Number",
          "repeatable": false
        },
        "b": {
          "label": "Country",
          "repeatable": false,
          "codelist": {
            "name": "MARC Code List for Countries",
            "url": "http://www.loc.gov/marc/countries/countries_code.html"
          }
        },
        "c": {
          "label": "Type of number",
          "repeatable": false
        },
        "d": {
          "label": "Date",
          "repeatable": true
        },
        "e": {
          "label": "Status",
          "repeatable": true
        },
        "f": {
          "label": "Party to document",
          "repeatable": true,
          "codelist": {
            "name": "MARC Organization Codes",
            "url": "http://www.loc.gov/marc/organizations/orgshome.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "015": {
      "tag": "015",
      "label": "National Bibliography Number",
      "url": "https://www.loc.gov/marc/bibliographic/bd015.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "National bibliography number",
          "repeatable": true
        },
        "q": {
          "label": "Qualifying information",
          "repeatable": true
        },
        "z": {
          "label": "Canceled/invalid national bibliography number",
          "repeatable": true
        },
        "2": {
          "label": "Source",
          "repeatable": false,
          "codelist": {
            "name": "National Bibliography Number Source Codes",
            "url": "http://www.loc.gov/standards/sourcelist/national-bibliography.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "016": {
      "tag": "016",
      "label": "National Bibliographic Agency Control Number",
      "url": "https://www.loc.gov/marc/bibliographic/bd016.html",
      "repeatable": true,
      "indicator1": {
        "label": "National bibliographic agency",
        "codes": {
          " ": {
            "label": "Library and Archives Canada"
          },
          "7": {
            "label": "Source specified in subfield $2"
          }
        }
      },
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Record control number",
          "repeatable": false
        },
        "z": {
          "label": "Canceled/invalid control number",
          "repeatable": true
        },
        "2": {
          "label": "Source",
          "repeatable": false,
          "codelist": {
            "name": "MARC Organization Codes",
            "url": "http://www.loc.gov/marc/organizations/orgshome.html"
          }
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "017": {
      "tag": "017",
      "label": "Copyright or Legal Deposit Number",
      "url": "https://www.loc.gov/marc/bibliographic/bd017.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": {
        "label": "Display constant controller",
        "codes": {
          " ": {
            "label": "Copyright or legal deposit number"
          },
          "8": {
            "label": "No display constant generated"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Copyright or legal deposit number",
          "repeatable": true
        },
        "b": {
          "label": "Assigning agency",
          "repeatable": false
        },
        "d": {
          "label": "Date",
          "repeatable": false
        },
        "i": {
          "label": "Display text",
          "repeatable": false
        },
        "z": {
          "label": "Canceled/invalid copyright or legal deposit number",
          "repeatable": true
        },
        "2": {
          "label": "Source",
          "repeatable": false,
          "codelist": {
            "name": "Copyright and Legal Deposit Number Source Codes",
            "url": "http://www.loc.gov/standards/sourcelist/copyright-legal-deposit.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "018": {
      "tag": "018",
      "label": "Copyright Article-Fee Code",
      "url": "https://www.loc.gov/marc/bibliographic/bd018.html",
      "repeatable": false,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Copyright article-fee code",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "020": {
      "tag": "020",
      "label": "International Standard Book Number",
      "url": "https://www.loc.gov/marc/bibliographic/bd020.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "International Standard Book Number",
          "repeatable": false
        },
        "c": {
          "label": "Terms of availability",
          "repeatable": false
        },
        "q": {
          "label": "Qualifying information",
          "repeatable": true
        },
        "z": {
          "label": "Canceled/invalid ISBN",
          "repeatable": true
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      },
      "historical-subfields": {
        "b": {
          "label": "Binding information (BK, MP, MU) [OBSOLETE]"
        }
      }
    },
    "022": {
      "tag": "022",
      "label": "International Standard Serial Number",
      "url": "https://www.loc.gov/marc/bibliographic/bd022.html",
      "repeatable": true,
      "indicator1": {
        "label": "Level of international interest",
        "codes": {
          " ": {
            "label": "No level specified"
          },
          "0": {
            "label": "Continuing resource of international interest"
          },
          "1": {
            "label": "Continuing resource not of international interest"
          }
        }
      },
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "International Standard Serial Number",
          "repeatable": false
        },
        "l": {
          "label": "ISSN-L",
          "repeatable": false
        },
        "m": {
          "label": "Canceled ISSN-L",
          "repeatable": true
        },
        "y": {
          "label": "Incorrect ISSN",
          "repeatable": true
        },
        "z": {
          "label": "Canceled ISSN",
          "repeatable": true
        },
        "2": {
          "label": "Source",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      },
      "historical-subfields": {
        "b": {
          "label": "Form of issue [OBSOLETE] [CAN/MARC only]"
        },
        "c": {
          "label": "Price [OBSOLETE] [CAN/MARC only]"
        }
      }
    },
    "024": {
      "tag": "024",
      "label": "Other Standard Identifier",
      "url": "https://www.loc.gov/marc/bibliographic/bd024.html",
      "repeatable": true,
      "indicator1": {
        "label": "Type of standard number or code",
        "codes": {
          "0": {
            "label": "International Standard Recording Code"
          },
          "1": {
            "label": "Universal Product Code"
          },
          "2": {
            "label": "International Standard Music Number"
          },
          "3": {
            "label": "International Article Number"
          },
          "4": {
            "label": "Serial Item and Contribution Identifier"
          },
          "7": {
            "label": "Source specified in subfield $2"
          },
          "8": {
            "label": "Unspecified type of standard number or code"
          }
        }
      },
      "indicator2": {
        "label": "Difference indicator",
        "codes": {
          " ": {
            "label": "No information provided"
          },
          "0": {
            "label": "No difference"
          },
          "1": {
            "label": "Difference"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Standard number or code",
          "repeatable": false
        },
        "c": {
          "label": "Terms of availability",
          "repeatable": false
        },
        "d": {
          "label": "Additional codes following the standard number or code",
          "repeatable": false
        },
        "q": {
          "label": "Qualifying information",
          "repeatable": true
        },
        "z": {
          "label": "Canceled/invalid standard number or code",
          "repeatable": true
        },
        "2": {
          "label": "Source of number or code",
          "repeatable": false,
          "codelist": {
            "name": "Standard Identifier Source Codes",
            "url": "https://www.loc.gov/standards/sourcelist/standard-identifier.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      },
      "historical-subfields": {
        "b": {
          "label": "Additional codes following the standard number [OBSOLETE]"
        }
      }
    },
    "025": {
      "tag": "025",
      "label": "Overseas Acquisition Number",
      "url": "https://www.loc.gov/marc/bibliographic/bd025.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Overseas acquisition number",
          "repeatable": true
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "026": {
      "tag": "026",
      "label": "Fingerprint Identifier",
      "url": "https://www.loc.gov/marc/bibliographic/bd026.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "First and second groups of characters",
          "repeatable": false
        },
        "b": {
          "label": "Third and fourth groups of characters",
          "repeatable": false
        },
        "c": {
          "label": "Date",
          "repeatable": false
        },
        "d": {
          "label": "Number of volume or part",
          "repeatable": true
        },
        "e": {
          "label": "Unparsed fingerprint",
          "repeatable": false
        },
        "2": {
          "label": "Source",
          "repeatable": false,
          "codelist": {
            "name": "Fingerprint Scheme Source Codes",
            "url": "http://www.loc.gov/standards/sourcelist/fingerprint.html"
          }
        },
        "5": {
          "label": "Institution to which field applies",
          "repeatable": true,
          "codelist": {
            "name": "MARC Organization Codes",
            "url": "http://www.loc.gov/marc/organizations/orgshome.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "027": {
      "tag": "027",
      "label": "Standard Technical Report Number",
      "url": "https://www.loc.gov/marc/bibliographic/bd027.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Standard technical report number",
          "repeatable": false
        },
        "q": {
          "label": "Qualifying information",
          "repeatable": true
        },
        "z": {
          "label": "Canceled/invalid number",
          "repeatable": true
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "028": {
      "tag": "028",
      "label": "Publisher or Distributor Number",
      "url": "https://www.loc.gov/marc/bibliographic/bd028.html",
      "repeatable": true,
      "indicator1": {
        "label": "Type of number",
        "codes": {
          "0": {
            "label": "Issue number"
          },
          "1": {
            "label": "Matrix number"
          },
          "2": {
            "label": "Plate number"
          },
          "3": {
            "label": "Other music publisher number"
          },
          "4": {
            "label": "Video recording publisher number"
          },
          "5": {
            "label": "Other publisher number"
          },
          "6": {
            "label": "Distributor number"
          }
        }
      },
      "indicator2": {
        "label": "Note/added entry controller",
        "codes": {
          "0": {
            "label": "No note, no added entry"
          },
          "1": {
            "label": "Note, added entry"
          },
          "2": {
            "label": "Note, no added entry"
          },
          "3": {
            "label": "No note, added entry"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Publisher or distributor number",
          "repeatable": false
        },
        "b": {
          "label": "Source",
          "repeatable": false
        },
        "q": {
          "label": "Qualifying information",
          "repeatable": true
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "030": {
      "tag": "030",
      "label": "CODEN Designation",
      "url": "https://www.loc.gov/marc/bibliographic/bd030.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Publisher or distributor number",
          "repeatable": false
        },
        "z": {
          "label": "Canceled/invalid CODEN",
          "repeatable": true
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "031": {
      "tag": "031",
      "label": "Musical Incipits Information",
      "url": "https://www.loc.gov/marc/bibliographic/bd031.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Number of work",
          "repeatable": false
        },
        "b": {
          "label": "Number of movement",
          "repeatable": false
        },
        "c": {
          "label": "Number of excerpt",
          "repeatable": false
        },
        "d": {
          "label": "Caption or heading",
          "repeatable": true
        },
        "e": {
          "label": "Role",
          "repeatable": false
        },
        "g": {
          "label": "Clef",
          "repeatable": false
        },
        "m": {
          "label": "Voice/instrument",
          "repeatable": false
        },
        "n": {
          "label": "Key signature",
          "repeatable": false
        },
        "o": {
          "label": "Time signature",
          "repeatable": false
        },
        "p": {
          "label": "Musical notation",
          "repeatable": false
        },
        "q": {
          "label": "General note",
          "repeatable": true
        },
        "r": {
          "label": "Key or mode",
          "repeatable": false
        },
        "s": {
          "label": "Coded validity note",
          "repeatable": true
        },
        "t": {
          "label": "Text incipit",
          "repeatable": true
        },
        "u": {
          "label": "Uniform Resource Identifier",
          "repeatable": true
        },
        "y": {
          "label": "Link text",
          "repeatable": true
        },
        "z": {
          "label": "Public note",
          "repeatable": true
        },
        "2": {
          "label": "System code",
          "repeatable": false,
          "codelist": {
            "name": "Musical Incipit Scheme Source Codes",
            "url": "https://www.loc.gov/standards/sourcelist/musical-incipit.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "032": {
      "tag": "032",
      "label": "Postal Registration Number",
      "url": "https://www.loc.gov/marc/bibliographic/bd032.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Postal registration number",
          "repeatable": false
        },
        "b": {
          "label": "Source agency assigning number",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "033": {
      "tag": "033",
      "label": "Date/Time and Place of an Event",
      "url": "https://www.loc.gov/marc/bibliographic/bd033.html",
      "repeatable": true,
      "indicator1": {
        "label": "Type of date in subfield $a",
        "codes": {
          " ": {
            "label": "No date information"
          },
          "0": {
            "label": "Single date"
          },
          "1": {
            "label": "Multiple single dates"
          },
          "2": {
            "label": "Range of dates"
          }
        }
      },
      "indicator2": {
        "label": "Type of event",
        "codes": {
          " ": {
            "label": "No information provided"
          },
          "0": {
            "label": "Capture"
          },
          "1": {
            "label": "Broadcast"
          },
          "2": {
            "label": "Finding"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Formatted date/time",
          "repeatable": true
        },
        "b": {
          "label": "Geographic classification area code",
          "repeatable": true
        },
        "c": {
          "label": "Geographic classification subarea code",
          "repeatable": true
        },
        "p": {
          "label": "Place of event",
          "repeatable": true
        },
        "0": {
          "label": "Authority record control number",
          "repeatable": true
        },
        "2": {
          "label": "Source of term",
          "repeatable": true,
          "codelist": {
            "name": "Subject Heading and Term Source Codes",
            "url": "http://www.loc.gov/standards/sourcelist/subject.html"
          }
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "034": {
      "tag": "034",
      "label": "Coded Cartographic Mathematical Data",
      "url": "https://www.loc.gov/marc/bibliographic/bd034.html",
      "repeatable": true,
      "indicator1": {
        "label": "Type of scale",
        "codes": {
          "0": {
            "label": "Scale indeterminable/No scale recorded"
          },
          "1": {
            "label": "Single scale"
          },
          "3": {
            "label": "Range of scales"
          }
        },
        "historical-codes": {
          "2": {
            "label": "Two or more scales (BK, MP, SE) [OBSOLETE]"
          }
        }
      },
      "indicator2": {
        "label": "Type of ring",
        "codes": {
          " ": {
            "label": "Not applicable"
          },
          "0": {
            "label": "Outer ring"
          },
          "1": {
            "label": "Exclusion ring"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Category of scale",
          "repeatable": false
        },
        "b": {
          "label": "Constant ratio linear horizontal scale",
          "repeatable": true
        },
        "c": {
          "label": "Constant ratio linear vertical scale",
          "repeatable": true
        },
        "d": {
          "label": "Coordinates - westernmost longitude",
          "repeatable": false
        },
        "e": {
          "label": "Coordinates - easternmost longitude",
          "repeatable": false
        },
        "f": {
          "label": "Coordinates - northernmost latitude",
          "repeatable": false
        },
        "g": {
          "label": "Coordinates - southernmost latitude",
          "repeatable": false
        },
        "h": {
          "label": "Angular scale",
          "repeatable": true
        },
        "j": {
          "label": "Declination - northern limit",
          "repeatable": false
        },
        "k": {
          "label": "Declination - southern limit",
          "repeatable": false
        },
        "m": {
          "label": "Right ascension - eastern limit",
          "repeatable": false
        },
        "n": {
          "label": "Right ascension - western limit",
          "repeatable": false
        },
        "p": {
          "label": "Equinox",
          "repeatable": false
        },
        "r": {
          "label": "Distance from earth",
          "repeatable": false
        },
        "s": {
          "label": "G-ring latitude",
          "repeatable": true
        },
        "t": {
          "label": "G-ring longitude",
          "repeatable": true
        },
        "x": {
          "label": "Beginning date",
          "repeatable": false
        },
        "y": {
          "label": "Ending date",
          "repeatable": false
        },
        "z": {
          "label": "Name of extraterrestrial body",
          "repeatable": false
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "2": {
          "label": "Source",
          "repeatable": false,
          "codelist": {
            "name": "Cartographic Data Source Codes",
            "url": "https://loc.gov/standards/sourcelist/cartographic-data.html"
          }
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "035": {
      "tag": "035",
      "label": "System Control Number",
      "url": "https://www.loc.gov/marc/bibliographic/bd035.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "System control number",
          "repeatable": false
        },
        "z": {
          "label": "Canceled/invalid control number",
          "repeatable": true
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "036": {
      "tag": "036",
      "label": "Original Study Number for Computer Data Files",
      "url": "https://www.loc.gov/marc/bibliographic/bd036.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Original study number",
          "repeatable": false
        },
        "b": {
          "label": "Source agency assigning number",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "037": {
      "tag": "037",
      "label": "Source of Acquisition",
      "url": "https://www.loc.gov/marc/bibliographic/bd037.html",
      "repeatable": true,
      "indicator1": {
        "label": "Source of acquisition sequence",
        "codes": {
          " ": {
            "label": "Not applicable/No information provided/Earliest"
          },
          "2": {
            "label": "Intervening"
          },
          "3": {
            "label": "Current/Latest"
          }
        }
      },
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Stock number",
          "repeatable": false
        },
        "b": {
          "label": "Source of stock number/acquisition",
          "repeatable": false
        },
        "c": {
          "label": "Terms of availability",
          "repeatable": true
        },
        "f": {
          "label": "Form of issue",
          "repeatable": true
        },
        "g": {
          "label": "Additional format characteristics",
          "repeatable": true
        },
        "n": {
          "label": "Note",
          "repeatable": true
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
        },
        "5": {
          "label": "Institution to which field applies",
          "repeatable": true
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "038": {
      "tag": "038",
      "label": "Record Content Licensor",
      "url": "https://www.loc.gov/marc/bibliographic/bd038.html",
      "repeatable": false,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Record content licensor",
          "repeatable": false,
          "codelist": {
            "name": "MARC Organization Codes",
            "url": "http://www.loc.gov/marc/organizations/orgshome.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "040": {
      "tag": "040",
      "label": "Cataloging Source",
      "url": "https://www.loc.gov/marc/bibliographic/bd040.html",
      "repeatable": false,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Original cataloging agency",
          "repeatable": false,
          "codelist": {
            "name": "MARC Organization Codes",
            "url": "http://www.loc.gov/marc/organizations/orgshome.html"
          }
        },
        "b": {
          "label": "Language of cataloging",
          "repeatable": false,
          "codelist": {
            "name": "MARC Code List for Languages",
            "url": "http://www.loc.gov/marc/languages/language_code.html"
          }
        },
        "c": {
          "label": "Transcribing agency",
          "repeatable": false,
          "codelist": {
            "name": "MARC Organization Codes",
            "url": "http://www.loc.gov/marc/organizations/orgshome.html"
          }
        },
        "d": {
          "label": "Modifying agency",
          "repeatable": true,
          "codelist": {
            "name": "MARC Organization Codes",
            "url": "http://www.loc.gov/marc/organizations/orgshome.html"
          }
        },
        "e": {
          "label": "Description conventions",
          "repeatable": true,
          "codelist": {
            "name": "Description Convention Source Codes",
            "url": "https://www.loc.gov/standards/sourcelist/descriptive-conventions.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "041": {
      "tag": "041",
      "label": "Language Code",
      "url": "https://www.loc.gov/marc/bibliographic/bd041.html",
      "repeatable": true,
      "indicator1": {
        "label": "Translation indication",
        "codes": {
          " ": {
            "label": "No information provided"
          },
          "0": {
            "label": "Item not a translation/does not include a translation"
          },
          "1": {
            "label": "Item is or includes a translation"
          }
        }
      },
      "indicator2": {
        "label": "Source of code",
        "codes": {
          " ": {
            "label": "MARC language code"
          },
          "7": {
            "label": "Source specified in subfield $2"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Language code of text/sound track or separate title",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Languages",
            "url": "http://www.loc.gov/marc/languages/language_code.html"
          }
        },
        "b": {
          "label": "Language code of summary or abstract",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Languages",
            "url": "http://www.loc.gov/marc/languages/language_code.html"
          }
        },
        "d": {
          "label": "Language code of sung or spoken text",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Languages",
            "url": "http://www.loc.gov/marc/languages/language_code.html"
          }
        },
        "e": {
          "label": "Language code of librettos",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Languages",
            "url": "http://www.loc.gov/marc/languages/language_code.html"
          }
        },
        "f": {
          "label": "Language code of table of contents",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Languages",
            "url": "http://www.loc.gov/marc/languages/language_code.html"
          }
        },
        "g": {
          "label": "Language code of accompanying material other than librettos",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Languages",
            "url": "http://www.loc.gov/marc/languages/language_code.html"
          }
        },
        "h": {
          "label": "Language code of original",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Languages",
            "url": "http://www.loc.gov/marc/languages/language_code.html"
          }
        },
        "j": {
          "label": "Language code of subtitles or captions",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Languages",
            "url": "http://www.loc.gov/marc/languages/language_code.html"
          }
        },
        "k": {
          "label": "Language code of intermediate translations",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Languages",
            "url": "http://www.loc.gov/marc/languages/language_code.html"
          }
        },
        "m": {
          "label": "Language code of original accompanying materials other than librettos",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Languages",
            "url": "http://www.loc.gov/marc/languages/language_code.html"
          }
        },
        "n": {
          "label": "Language code of original libretto",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Languages",
            "url": "http://www.loc.gov/marc/languages/language_code.html"
          }
        },
        "2": {
          "label": "Source of code",
          "repeatable": false,
          "codelist": {
            "name": "Language Code and Term Source Codes",
            "url": "http://www.loc.gov/standards/sourcelist/language.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      },
      "historical-subfields": {
        "c": {
          "label": "Languages of separate titles (VM) [OBSOLETE, 1972], Languages of available translation (SE) [OBSOLETE, 1977]"
        }
      }
    },
    "042": {
      "tag": "042",
      "label": "Authentication Code",
      "url": "https://www.loc.gov/marc/bibliographic/bd042.html",
      "repeatable": false,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Authentication code",
          "repeatable": true,
          "codelist": {
            "name": "MARC Authentication Action Code List",
            "url": "http://www.loc.gov/standards/valuelist/marcauthen.html"
          }
        }
      }
    },
    "043": {
      "tag": "043",
      "label": "Geographic Area Code",
      "url": "https://www.loc.gov/marc/bibliographic/bd043.html",
      "repeatable": false,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Geographic area code",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Geographic Areas",
            "url": "http://www.loc.gov/marc/geoareas/"
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            "url": "http://www.loc.gov/marc/organizations/orgshome.html"
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        },
        "y": {
          "label": "Table sequence number for internal subarrangement or add table",
          "repeatable": true
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        "z": {
          "label": "Table identification",
          "repeatable": true
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        "2": {
          "label": "Edition number",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
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      }
    },
    "084": {
      "tag": "084",
      "label": "Other Classificaton Number",
      "url": "https://www.loc.gov/marc/bibliographic/bd084.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Classification number",
          "repeatable": true
        },
        "b": {
          "label": "Item number",
          "repeatable": false
        },
        "q": {
          "label": "Assigning agency",
          "repeatable": false,
          "codelist": {
            "name": "MARC Organization Codes",
            "url": "http://www.loc.gov/marc/organizations/orgshome.html"
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        },
        "2": {
          "label": "Number source",
          "repeatable": false,
          "codelist": {
            "name": "Classification Scheme Source Codes",
            "url": "http://www.loc.gov/standards/sourcelist/classification.html"
          }
        },
        "6": {
          "label": "Linkage",
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        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "085": {
      "tag": "085",
      "label": "Synthesized Classification Number Components",
      "url": "https://www.loc.gov/marc/bibliographic/bd085.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Number where instructions are found-single number or beginning number of span",
          "repeatable": true
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        "b": {
          "label": "Base number",
          "repeatable": true
        },
        "c": {
          "label": "Classification number-ending number of span",
          "repeatable": true
        },
        "f": {
          "label": "Facet designator",
          "repeatable": true
        },
        "r": {
          "label": "Root number",
          "repeatable": true
        },
        "s": {
          "label": "Digits added from classification number in schedule or external table",
          "repeatable": true
        },
        "t": {
          "label": "Digits added from internal subarrangement or add table",
          "repeatable": true
        },
        "u": {
          "label": "Number being analyzed",
          "repeatable": true
        },
        "v": {
          "label": "Number in internal subarrangement or add table where instructions are found",
          "repeatable": true
        },
        "w": {
          "label": "Table identification-Internal subarrangement or add table",
          "repeatable": true
        },
        "y": {
          "label": "Table sequence number for internal subarrangement or add table",
          "repeatable": true
        },
        "z": {
          "label": "Table identification",
          "repeatable": true
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "6": {
          "label": "Linkage",
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        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "086": {
      "tag": "086",
      "label": "Government Document Classification Number",
      "url": "https://www.loc.gov/marc/bibliographic/bd086.html",
      "repeatable": true,
      "indicator1": {
        "label": "Number source",
        "codes": {
          " ": {
            "label": "Source specified in subfield $2"
          },
          "0": {
            "label": "Superintendent of Documents Classification System"
          },
          "1": {
            "label": "Government of Canada Publications: Outline of Classification"
          }
        },
        "historical-codes": {
          "0": {
            "label": "United States"
          },
          "1": {
            "label": "Canada"
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          "2-9": {
            "label": "Reserved"
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      "subfields": {
        "a": {
          "label": "Classification number",
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        },
        "z": {
          "label": "Canceled/invalid classification number",
          "repeatable": true
        },
        "2": {
          "label": "Number source",
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          "codelist": {
            "name": "Classification Scheme Source Codes",
            "url": "http://www.loc.gov/standards/sourcelist/classification.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "088": {
      "tag": "088",
      "label": "Report Number",
      "url": "https://www.loc.gov/marc/bibliographic/bd088.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Report number",
          "repeatable": false
        },
        "z": {
          "label": "Canceled/invalid report number",
          "repeatable": true
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "100": {
      "tag": "100",
      "label": "Main Entry - Personal Name",
      "url": "https://www.loc.gov/marc/bibliographic/bd100.html",
      "repeatable": false,
      "indicator1": {
        "label": "Type of personal name entry element",
        "codes": {
          "0": {
            "label": "Forename"
          },
          "1": {
            "label": "Surname"
          },
          "3": {
            "label": "Family name"
          }
        }
      },
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Personal name",
          "repeatable": false
        },
        "b": {
          "label": "Numeration",
          "repeatable": false
        },
        "c": {
          "label": "Titles and words associated with a name",
          "repeatable": true
        },
        "d": {
          "label": "Dates associated with a name",
          "repeatable": false
        },
        "e": {
          "label": "Relator term",
          "repeatable": true
        },
        "f": {
          "label": "Date of a work",
          "repeatable": false
        },
        "g": {
          "label": "Miscellaneous information",
          "repeatable": true
        },
        "j": {
          "label": "Attribution qualifier",
          "repeatable": true
        },
        "k": {
          "label": "Form subheading",
          "repeatable": true
        },
        "l": {
          "label": "Language of a work",
          "repeatable": false
        },
        "n": {
          "label": "Number of part/section of a work",
          "repeatable": true
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "q": {
          "label": "Fuller form of name",
          "repeatable": false
        },
        "t": {
          "label": "Title of a work",
          "repeatable": false
        },
        "u": {
          "label": "Affiliation",
          "repeatable": false
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "4": {
          "label": "Relator code",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Relators",
            "url": "https://www.loc.gov/marc/relators/relaterm.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "110": {
      "tag": "110",
      "label": "Main Entry - Corporate Name",
      "url": "https://www.loc.gov/marc/bibliographic/bd110.html",
      "repeatable": false,
      "indicator1": {
        "label": "Type of corporate name entry element",
        "codes": {
          "0": {
            "label": "Inverted name"
          },
          "1": {
            "label": "Jurisdiction name"
          },
          "2": {
            "label": "Name in direct order"
          }
        }
      },
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Corporate name or jurisdiction name as entry element",
          "repeatable": false
        },
        "b": {
          "label": "Subordinate unit",
          "repeatable": true
        },
        "c": {
          "label": "Location of meeting",
          "repeatable": true
        },
        "d": {
          "label": "Date of meeting or treaty signing",
          "repeatable": true
        },
        "e": {
          "label": "Relator term",
          "repeatable": true
        },
        "f": {
          "label": "Date of a work",
          "repeatable": false
        },
        "g": {
          "label": "Miscellaneous information",
          "repeatable": true
        },
        "k": {
          "label": "Form subheading",
          "repeatable": true
        },
        "l": {
          "label": "Language of a work",
          "repeatable": false
        },
        "n": {
          "label": "Number of part/section/meeting",
          "repeatable": true
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "t": {
          "label": "Title of a work",
          "repeatable": false
        },
        "u": {
          "label": "Affiliation",
          "repeatable": false
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "4": {
          "label": "Relator code",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Relators",
            "url": "https://www.loc.gov/marc/relators/relaterm.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "111": {
      "tag": "111",
      "label": "Main Entry - Meeting Name",
      "url": "https://www.loc.gov/marc/bibliographic/bd111.html",
      "repeatable": false,
      "indicator1": {
        "label": "Type of meeting name entry element",
        "codes": {
          "0": {
            "label": "Inverted name"
          },
          "1": {
            "label": "Jurisdiction name"
          },
          "2": {
            "label": "Name in direct order"
          }
        }
      },
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Meeting name or jurisdiction name as entry element",
          "repeatable": false
        },
        "c": {
          "label": "Location of meeting",
          "repeatable": true
        },
        "d": {
          "label": "Date of meeting",
          "repeatable": false
        },
        "e": {
          "label": "Subordinate unit",
          "repeatable": true
        },
        "f": {
          "label": "Date of a work",
          "repeatable": false
        },
        "g": {
          "label": "Miscellaneous information",
          "repeatable": true
        },
        "j": {
          "label": "Relator term",
          "repeatable": true
        },
        "k": {
          "label": "Form subheading",
          "repeatable": true
        },
        "l": {
          "label": "Language of a work",
          "repeatable": false
        },
        "n": {
          "label": "Number of part/section/meeting",
          "repeatable": true
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "q": {
          "label": "Name of meeting following jurisdiction name entry element",
          "repeatable": false
        },
        "t": {
          "label": "Title of a work",
          "repeatable": false
        },
        "u": {
          "label": "Affiliation",
          "repeatable": false
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "4": {
          "label": "Relationship",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Relators",
            "url": "https://www.loc.gov/marc/relators/relaterm.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "130": {
      "tag": "130",
      "label": "Main Entry - Uniform Title",
      "url": "https://www.loc.gov/marc/bibliographic/bd130.html",
      "repeatable": false,
      "indicator1": {
        "label": "Nonfiling characters",
        "codes": {
          "0-9": {
            "label": "Number of nonfiling characters"
          }
        }
      },
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Uniform title",
          "repeatable": false
        },
        "d": {
          "label": "Date of treaty signing",
          "repeatable": true
        },
        "f": {
          "label": "Date of a work",
          "repeatable": false
        },
        "g": {
          "label": "Miscellaneous information",
          "repeatable": true
        },
        "h": {
          "label": "Medium",
          "repeatable": false
        },
        "k": {
          "label": "Form subheading",
          "repeatable": true
        },
        "l": {
          "label": "Language of a work",
          "repeatable": false
        },
        "m": {
          "label": "Medium of performance for music",
          "repeatable": true
        },
        "n": {
          "label": "Number of part/section of a work",
          "repeatable": true
        },
        "o": {
          "label": "Arranged statement for music",
          "repeatable": false
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "r": {
          "label": "Key for music",
          "repeatable": false
        },
        "s": {
          "label": "Version",
          "repeatable": false
        },
        "t": {
          "label": "Title of a work",
          "repeatable": false
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "210": {
      "tag": "210",
      "label": "Abbreviated Title",
      "url": "https://www.loc.gov/marc/bibliographic/bd210.html",
      "repeatable": true,
      "indicator1": {
        "label": "Title added entry",
        "codes": {
          "0": {
            "label": "No added entry"
          },
          "1": {
            "label": "Added entry"
          }
        }
      },
      "indicator2": {
        "label": "Type",
        "codes": {
          " ": {
            "label": "Abbreviated key title"
          },
          "0": {
            "label": "Other abbreviated title"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Abbreviated title",
          "repeatable": false
        },
        "b": {
          "label": "Qualifying information",
          "repeatable": false
        },
        "2": {
          "label": "Source",
          "repeatable": true,
          "codelist": {
            "name": "Abbreviated Title Source Codes",
            "url": "http://www.loc.gov/standards/sourcelist/abbreviated-title.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "222": {
      "tag": "222",
      "label": "Key Title",
      "url": "https://www.loc.gov/marc/bibliographic/bd222.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": {
        "label": "Nonfiling characters",
        "codes": {
          "0": {
            "label": "No nonfiling characters"
          },
          "1-9": {
            "label": "Number of nonfiling characters"
          }
        },
        "historical-codes": {
          "0": {
            "label": "Key title is same as field 245 / No key title added entry; title proper same"
          },
          "1": {
            "label": "Key title is not the same as field 245 / Key title added entry; title proper different"
          },
          "2": {
            "label": "Key title added entry; title proper same"
          },
          "3": {
            "label": "No key title added entry; title proper different"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Key title",
          "repeatable": false
        },
        "b": {
          "label": "Qualifying information",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "240": {
      "tag": "240",
      "label": "Uniform Title",
      "url": "https://www.loc.gov/marc/bibliographic/bd240.html",
      "repeatable": false,
      "indicator1": {
        "label": "Uniform title printed or displayed",
        "codes": {
          "0": {
            "label": "Not printed or displayed"
          },
          "1": {
            "label": "Printed or displayed"
          }
        },
        "historical-codes": {
          "2": {
            "label": "Not printed on card, title added entry (MU) [OBSOLETE, 1993]"
          },
          "3": {
            "label": "Printed on card, title added entry (MU) [OBSOLETE, 1993]"
          }
        }
      },
      "indicator2": {
        "label": "Nonfiling characters",
        "codes": {
          "0-9": {
            "label": "Number of nonfiling characters"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Uniform title",
          "repeatable": false
        },
        "d": {
          "label": "Date of treaty signing",
          "repeatable": true
        },
        "f": {
          "label": "Date of a work",
          "repeatable": false
        },
        "g": {
          "label": "Miscellaneous information",
          "repeatable": true
        },
        "h": {
          "label": "Medium",
          "repeatable": false
        },
        "k": {
          "label": "Form subheading",
          "repeatable": true
        },
        "l": {
          "label": "Language of a work",
          "repeatable": false
        },
        "m": {
          "label": "Medium of performance for music",
          "repeatable": true
        },
        "n": {
          "label": "Number of part/section of a work",
          "repeatable": true
        },
        "o": {
          "label": "Arranged statement for music",
          "repeatable": false
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "r": {
          "label": "Key for music",
          "repeatable": false
        },
        "s": {
          "label": "Version",
          "repeatable": false
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "242": {
      "tag": "242",
      "label": "Translation of Title by Cataloging Agency",
      "url": "https://www.loc.gov/marc/bibliographic/bd242.html",
      "repeatable": true,
      "indicator1": {
        "label": "Title added entry",
        "codes": {
          "0": {
            "label": "No added entry"
          },
          "1": {
            "label": "Added entry"
          }
        }
      },
      "indicator2": {
        "label": "Nonfiling characters",
        "codes": {
          "0": {
            "label": "No nonfiling characters"
          },
          "1-9": {
            "label": "Number of nonfiling characters"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Title",
          "repeatable": false
        },
        "b": {
          "label": "Remainder of title",
          "repeatable": false
        },
        "c": {
          "label": "Statement of responsibility, etc.",
          "repeatable": false
        },
        "h": {
          "label": "Medium",
          "repeatable": false
        },
        "n": {
          "label": "Number of part/section of a work",
          "repeatable": true
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "y": {
          "label": "Language code of translated title",
          "repeatable": false,
          "codelist": {
            "name": "MARC Code List for Languages",
            "url": "http://www.loc.gov/marc/languages/language_code.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      },
      "historical-subfields": {
        "d": {
          "label": "Designation of section (BK, AM, MP, MU, VM, SE) [OBSOLETE, 1979]"
        },
        "e": {
          "label": "Name of part/section (BK, AM, MP, MU, VM, SE) [OBSOLETE, 1979]"
        }
      }
    },
    "243": {
      "tag": "243",
      "label": "Collective Uniform Title",
      "url": "https://www.loc.gov/marc/bibliographic/bd243.html",
      "repeatable": false,
      "indicator1": {
        "label": "Uniform title printed or displayed",
        "codes": {
          "0": {
            "label": "Not printed or displayed"
          },
          "1": {
            "label": "Printed or displayed"
          }
        },
        "historical-codes": {
          "2": {
            "label": "Not printed on card, title added entry (MU) [USMARC only] [OBSOLETE, 1993] / Selections (extracts) [CAN/MARC only] [OBSOLETE]"
          },
          "3": {
            "label": "Printed on card, title added entry (MU) [USMARC only] [OBSOLETE, 1993] / Other collective titles [CAN/MARC only] [OBSOLETE]"
          }
        }
      },
      "indicator2": {
        "label": "Nonfiling characters",
        "codes": {
          "0-9": {
            "label": "Number of nonfiling characters"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Uniform title",
          "repeatable": false
        },
        "d": {
          "label": "Date of treaty signing",
          "repeatable": true
        },
        "f": {
          "label": "Date of a work",
          "repeatable": false
        },
        "g": {
          "label": "Miscellaneous information",
          "repeatable": true
        },
        "h": {
          "label": "Medium",
          "repeatable": false
        },
        "k": {
          "label": "Form subheading",
          "repeatable": true
        },
        "l": {
          "label": "Language of a work",
          "repeatable": false
        },
        "m": {
          "label": "Medium of performance for music",
          "repeatable": true
        },
        "n": {
          "label": "Number of part/section of a work",
          "repeatable": true
        },
        "o": {
          "label": "Arranged statement for music",
          "repeatable": false
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "r": {
          "label": "Key for music",
          "repeatable": false
        },
        "s": {
          "label": "Version",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
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      "tag": "245",
      "label": "Title Statement",
      "url": "https://www.loc.gov/marc/bibliographic/bd245.html",
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      "indicator1": {
        "label": "Title added entry",
        "codes": {
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            "label": "No added entry"
          },
          "1": {
            "label": "Added entry"
          }
        }
      },
      "indicator2": {
        "label": "Nonfiling characters",
        "codes": {
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            "label": "No nonfiling characters"
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          "1-9": {
            "label": "Number of nonfiling characters"
          }
        }
      },
      "subfields": {
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          "label": "Title",
          "repeatable": false
        },
        "b": {
          "label": "Remainder of title",
          "repeatable": false
        },
        "c": {
          "label": "Statement of responsibility, etc.",
          "repeatable": false
        },
        "f": {
          "label": "Inclusive dates",
          "repeatable": false
        },
        "g": {
          "label": "Bulk dates",
          "repeatable": false
        },
        "h": {
          "label": "Medium",
          "repeatable": false
        },
        "k": {
          "label": "Form",
          "repeatable": true
        },
        "n": {
          "label": "Number of part/section of a work",
          "repeatable": true
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "s": {
          "label": "Version",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
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        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      },
      "historical-subfields": {
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          "label": "Designation of section/part/series (SE) [OBSOLETE, 1979]"
        },
        "e": {
          "label": "Name of part/section/series (SE) [OBSOLETE, 1979]"
        }
      }
    },
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      "tag": "246",
      "label": "Varying Form of Title",
      "url": "https://www.loc.gov/marc/bibliographic/bd246.html",
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      "indicator1": {
        "label": "Note/added entry controller",
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            "label": "Note, no added entry"
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          "1": {
            "label": "Note, added entry"
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          "2": {
            "label": "No note, no added entry"
          },
          "3": {
            "label": "No note, added entry"
          }
        }
      },
      "indicator2": {
        "label": "Type of title",
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            "label": "No type specified"
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            "label": "Portion of title"
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          "1": {
            "label": "Parallel title"
          },
          "2": {
            "label": "Distinctive title"
          },
          "3": {
            "label": "Other title"
          },
          "4": {
            "label": "Cover title"
          },
          "5": {
            "label": "Added title page title"
          },
          "6": {
            "label": "Caption title"
          },
          "7": {
            "label": "Running title"
          },
          "8": {
            "label": "Spine title"
          }
        }
      },
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          "label": "Title proper/short title",
          "repeatable": false
        },
        "b": {
          "label": "Remainder of title",
          "repeatable": false
        },
        "f": {
          "label": "Date or sequential designation",
          "repeatable": false
        },
        "g": {
          "label": "Miscellaneous information",
          "repeatable": true
        },
        "h": {
          "label": "Medium",
          "repeatable": false
        },
        "i": {
          "label": "Display text",
          "repeatable": false
        },
        "n": {
          "label": "Number of part/section of a work",
          "repeatable": true
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "5": {
          "label": "Institution to which field applies",
          "repeatable": false,
          "codelist": {
            "name": "MARC Organization Codes",
            "url": "http://www.loc.gov/marc/organizations/orgshome.html"
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        },
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          "label": "Linkage",
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        },
        "8": {
          "label": "Field link and sequence number",
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        }
      },
      "historical-subfields": {
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          "label": "Remainder of title page transcription [OBSOLETE, 1991] [CAN/MARC only]"
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        "d": {
          "label": "Designation of section/part/series (SE) [OBSOLETE, 1979]"
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          "label": "Name of section/part/series (SE) [OBSOLETE, 1979]"
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      }
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      "tag": "247",
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      "url": "https://www.loc.gov/marc/bibliographic/bd247.html",
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            "label": "No added entry"
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            "label": "Display note"
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            "label": "Do not display note"
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        }
      },
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          "label": "Title",
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          "label": "Remainder of title",
          "repeatable": false
        },
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          "label": "Date or sequential designation",
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        },
        "g": {
          "label": "Miscellaneous information",
          "repeatable": true
        },
        "h": {
          "label": "Medium",
          "repeatable": false
        },
        "n": {
          "label": "Number of part/section of a work",
          "repeatable": true
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "x": {
          "label": "International Standard Serial Number",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      },
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          "label": "Designation of section/part/series (SE) [OBSOLETE, 1979]"
        },
        "e": {
          "label": "Name of section/part/series (SE) [OBSOLETE, 1979]"
        },
        "c": {
          "label": "Remainder of Title Page transcription [OBSOLETE] [CAN/MARC only]"
        }
      }
    },
    "250": {
      "tag": "250",
      "label": "Edition Statement",
      "url": "https://www.loc.gov/marc/bibliographic/bd250.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Edition statement",
          "repeatable": false
        },
        "b": {
          "label": "Remainder of edition statement",
          "repeatable": false
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "254": {
      "tag": "254",
      "label": "Musical Presentation Statement",
      "url": "https://www.loc.gov/marc/bibliographic/bd254.html",
      "repeatable": false,
      "indicator1": null,
      "indicator2": null,
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          "label": "Musical presentation statement",
          "repeatable": false
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        "6": {
          "label": "Linkage",
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        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
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      "tag": "255",
      "label": "Cartographic Mathematical Data",
      "url": "https://www.loc.gov/marc/bibliographic/bd255.html",
      "repeatable": true,
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      "indicator2": null,
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          "label": "Statement of scale",
          "repeatable": false
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        "b": {
          "label": "Statement of projection",
          "repeatable": false
        },
        "c": {
          "label": "Statement of coordinates",
          "repeatable": false
        },
        "d": {
          "label": "Statement of zone",
          "repeatable": false
        },
        "e": {
          "label": "Statement of equinox",
          "repeatable": false
        },
        "f": {
          "label": "Outer G-ring coordinate pairs",
          "repeatable": false
        },
        "g": {
          "label": "Exclusion G-ring coordinate pairs",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
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      }
    },
    "256": {
      "tag": "256",
      "label": "Computer File Characteristics",
      "url": "https://www.loc.gov/marc/bibliographic/bd256.html",
      "repeatable": false,
      "indicator1": null,
      "indicator2": null,
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          "label": "Computer file characteristics",
          "repeatable": false
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          "label": "Linkage",
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        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
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      }
    },
    "257": {
      "tag": "257",
      "label": "Country of Producing Entity",
      "url": "https://www.loc.gov/marc/bibliographic/bd257.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
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          "label": "Authority record control number or standard number",
          "repeatable": true
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        "2": {
          "label": "Source",
          "repeatable": false,
          "codelist": {
            "name": "Subject Heading and Term Source Codes",
            "url": "http://www.loc.gov/standards/sourcelist/subject.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
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      "tag": "258",
      "label": "Philatelic Issue Data",
      "url": "https://www.loc.gov/marc/bibliographic/bd258.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Issuing jurisdiction",
          "repeatable": false
        },
        "b": {
          "label": "Denomination",
          "repeatable": false
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        "6": {
          "label": "Linkage",
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        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
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    },
    "260": {
      "tag": "260",
      "label": "Publication, Distribution, etc. (Imprint)",
      "url": "https://www.loc.gov/marc/bibliographic/bd260.html",
      "repeatable": true,
      "indicator1": {
        "label": "Sequence of publishing statements",
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            "label": "Intervening publisher"
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          "3": {
            "label": "Current/latest publisher"
          }
        },
        "historical-codes": {
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            "label": "Publisher, distributor, etc. is present"
          },
          "1": {
            "label": "Publisher, distributor, etc. not present"
          }
        }
      },
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          "label": "Name of publisher, distributor, etc.",
          "repeatable": true
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        "c": {
          "label": "Date of publication, distribution, etc.",
          "repeatable": true
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        "e": {
          "label": "Place of manufacture",
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        },
        "f": {
          "label": "Manufacturer",
          "repeatable": true
        },
        "g": {
          "label": "Date of manufacture",
          "repeatable": true
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        "3": {
          "label": "Materials specified",
          "repeatable": false
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        "6": {
          "label": "Linkage",
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        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      },
      "historical-subfields": {
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          "label": "Plate or publisher's number for music (Pre-AACR2) [OBSOLETE, 1981] [CAN/MARC only] / Plate or publisher's number for music (Pre-AACR2) [OBSOLETE, 1999] [USMARC only]"
        },
        "k": {
          "label": "Identification/manufacturer number [OBSOLETE, 1988] [CAN/MARC only]"
        },
        "l": {
          "label": "Matrix and/or take number [OBSOLETE, 1988] [CAN/MARC only]"
        }
      }
    },
    "263": {
      "tag": "263",
      "label": "Projected Publication Date",
      "url": "https://www.loc.gov/marc/bibliographic/bd263.html",
      "repeatable": false,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
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          "label": "Projected publication date",
          "repeatable": false
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        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "264": {
      "tag": "264",
      "label": "Production, Publication, Distribution, Manufacture, and Copyright Notice",
      "url": "https://www.loc.gov/marc/bibliographic/bd264.html",
      "repeatable": true,
      "indicator1": {
        "label": "Sequence of statements",
        "codes": {
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            "label": "Not applicable/No information provided/Earliest"
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            "label": "Intervening"
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          "3": {
            "label": "Current/Latest"
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        }
      },
      "indicator2": {
        "label": "Function of entity",
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            "label": "Production"
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          "1": {
            "label": "Publication"
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          "2": {
            "label": "Distribution"
          },
          "3": {
            "label": "Manufacture"
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          "4": {
            "label": "Copyright notice date"
          }
        }
      },
      "subfields": {
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          "label": "Place of production, publication, distribution, manufacture",
          "repeatable": true
        },
        "b": {
          "label": "Name of producer, publisher, distributor, manufacturer",
          "repeatable": true
        },
        "c": {
          "label": "Date of production, publication, distribution, manufacture, or copyright notice",
          "repeatable": true
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
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        "6": {
          "label": "Linkage",
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        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "270": {
      "tag": "270",
      "label": "Address",
      "url": "https://www.loc.gov/marc/bibliographic/bd270.html",
      "repeatable": true,
      "indicator1": {
        "label": "Level",
        "codes": {
          " ": {
            "label": "No level specified"
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          "1": {
            "label": "Primary"
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          "2": {
            "label": "Secondary"
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        }
      },
      "indicator2": {
        "label": "Type of address",
        "codes": {
          " ": {
            "label": "No type specified"
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          "0": {
            "label": "Mailing"
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          "7": {
            "label": "Type specified in subfield $i"
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        }
      },
      "subfields": {
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          "label": "Address",
          "repeatable": true
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        "b": {
          "label": "City",
          "repeatable": false
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        "c": {
          "label": "State or province",
          "repeatable": false
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        "d": {
          "label": "Country",
          "repeatable": false
        },
        "e": {
          "label": "Postal code",
          "repeatable": false
        },
        "f": {
          "label": "Terms preceding attention name",
          "repeatable": false
        },
        "g": {
          "label": "Attention name",
          "repeatable": false
        },
        "h": {
          "label": "Attention position",
          "repeatable": false
        },
        "i": {
          "label": "Type of address",
          "repeatable": false
        },
        "j": {
          "label": "Specialized telephone number",
          "repeatable": true
        },
        "k": {
          "label": "Telephone number",
          "repeatable": true
        },
        "l": {
          "label": "Fax number",
          "repeatable": true
        },
        "m": {
          "label": "Electronic mail address",
          "repeatable": true
        },
        "n": {
          "label": "TDD or TTY number",
          "repeatable": true
        },
        "p": {
          "label": "Contact person",
          "repeatable": true
        },
        "q": {
          "label": "Title of contact person",
          "repeatable": true
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        "r": {
          "label": "Hours",
          "repeatable": true
        },
        "z": {
          "label": "Public note",
          "repeatable": true
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        "4": {
          "label": "Relationship",
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          "codelist": {
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            "url": "https://www.loc.gov/marc/relators/relaterm.html"
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        "6": {
          "label": "Linkage",
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        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "300": {
      "tag": "300",
      "label": "Physical Description",
      "url": "https://www.loc.gov/marc/bibliographic/bd300.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Extent",
          "repeatable": true
        },
        "b": {
          "label": "Other physical details",
          "repeatable": false
        },
        "c": {
          "label": "Dimensions",
          "repeatable": true
        },
        "e": {
          "label": "Accompanying material",
          "repeatable": false
        },
        "f": {
          "label": "Type of unit",
          "repeatable": true
        },
        "g": {
          "label": "Size of unit",
          "repeatable": true
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      },
      "historical-subfields": {
        "d": {
          "label": "Accompanying material [OBSOLETE, 1997] [CAN/MARC only]"
        },
        "m": {
          "label": "Identification/manufacturer number [pre-AACR2 records only] [OBSOLETE, 1988] [CAN/MARC only]"
        },
        "n": {
          "label": "Matrix and/or take number [Sound recordings, pre-AACR2 records only] [OBSOLETE, 1988] [CAN/MARC only]"
        }
      }
    },
    "306": {
      "tag": "306",
      "label": "Playing Time",
      "url": "https://www.loc.gov/marc/bibliographic/bd306.html",
      "repeatable": false,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Playing time",
          "repeatable": true
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "307": {
      "tag": "307",
      "label": "Hours, etc.",
      "url": "https://www.loc.gov/marc/bibliographic/bd307.html",
      "repeatable": true,
      "indicator1": {
        "label": "Display constant controller",
        "codes": {
          " ": {
            "label": "Hours"
          },
          "8": {
            "label": "No display constant generated"
          }
        }
      },
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Hours",
          "repeatable": false
        },
        "b": {
          "label": "Additional information",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "310": {
      "tag": "310",
      "label": "Current Publication Frequency",
      "url": "https://www.loc.gov/marc/bibliographic/bd310.html",
      "repeatable": false,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Current publication frequency",
          "repeatable": false
        },
        "b": {
          "label": "Date of current publication frequency",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "321": {
      "tag": "321",
      "label": "Former Publication Frequency",
      "url": "https://www.loc.gov/marc/bibliographic/bd321.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
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          "label": "Former publication frequency",
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        "b": {
          "label": "Dates of former publication frequency",
          "repeatable": false
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        "6": {
          "label": "Linkage",
          "repeatable": false
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        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
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      }
    },
    "336": {
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      "label": "Content Type",
      "url": "https://www.loc.gov/marc/bibliographic/bd336.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
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          "repeatable": true
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        "b": {
          "label": "Content type code",
          "repeatable": true
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        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "2": {
          "label": "Source",
          "repeatable": false,
          "codelist": {
            "name": "Genre/Form Code and Term Source Codes",
            "url": "http://www.loc.gov/standards/sourcelist/genre-form.html"
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        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
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          "label": "Record control number",
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          "label": "Public note",
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          "label": "Fixed-length data elements of reproduction",
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          "label": "Linkage",
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          "label": "Field link and sequence number",
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          "label": "Material specific details",
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          "label": "International Standard Book Number",
          "repeatable": true
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          "label": "Materials specified",
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          "label": "Linkage",
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            "label": "Holder of oral tapes (AM) [OBSOLETE, 1984]"
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          "label": "Telecommunications address",
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          "label": "Grant number",
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          "label": "Undifferentiated number",
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          "label": "Jurisdiction",
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          "label": "Authorization",
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          "label": "Institution to which field applies",
          "repeatable": false
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          "label": "Linkage",
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          "label": "Field link and sequence number",
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    },
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      "url": "https://www.loc.gov/marc/bibliographic/bd541.html",
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            "label": "No information provided"
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            "label": "Private"
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            "label": "Not private"
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          "label": "Method of acquisition",
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          "label": "Date of acquisition",
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          "label": "Accession number",
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          "label": "Owner",
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        "h": {
          "label": "Purchase price",
          "repeatable": false
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        "n": {
          "label": "Extent",
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          "label": "Type of unit",
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          "label": "Materials specified",
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        "5": {
          "label": "Institution to which field applies",
          "repeatable": false
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          "label": "Linkage",
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        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
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      "url": "https://www.loc.gov/marc/bibliographic/bd542.html",
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            "label": "No information provided"
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          "label": "Corporate creator",
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        "d": {
          "label": "Copyright holder",
          "repeatable": true
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        "e": {
          "label": "Copyright holder contact information",
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        "f": {
          "label": "Copyright statement",
          "repeatable": true
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        "g": {
          "label": "Copyright date",
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          "label": "Copyright renewal date",
          "repeatable": true
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        "i": {
          "label": "Publication date",
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        "j": {
          "label": "Creation date",
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        "k": {
          "label": "Publisher",
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        "l": {
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          "repeatable": false
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          "label": "Supplying agency",
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        "r": {
          "label": "Jurisdiction of copyright assessment",
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          "label": "Source of information",
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          "label": "Uniform Resource Identifier",
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          "label": "Title",
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          "label": "Provenance",
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          "label": "Note",
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        "b": {
          "label": "Expansion",
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        "u": {
          "label": "Uniform Resource Identifier",
          "repeatable": true
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        "6": {
          "label": "Linkage",
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        },
        "8": {
          "label": "Field link and sequence number",
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      }
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      "tag": "546",
      "label": "Language Note",
      "url": "https://www.loc.gov/marc/bibliographic/bd546.html",
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      "indicator2": null,
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          "label": "Language note",
          "repeatable": false
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        "b": {
          "label": "Information code or alphabet",
          "repeatable": true
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        "3": {
          "label": "Materials specified",
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        "6": {
          "label": "Linkage",
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          "label": "Field link and sequence number",
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          "label": "Source of note information (SE) [OBSOLETE, 1990]"
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          "label": "Field link and sequence number",
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          "label": "Issuing body note",
          "repeatable": false
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        "6": {
          "label": "Linkage",
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        "8": {
          "label": "Field link and sequence number",
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          "label": "Source of note information (SE) [OBSOLETE, 1990]"
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        "d": {
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        "f": {
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        "h": {
          "label": "Codeset name and source",
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        "i": {
          "label": "Unrepresentable domain",
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        "j": {
          "label": "Attribute units of measurement and resolution",
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        "k": {
          "label": "Beginning and ending date of attribute values",
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        "l": {
          "label": "Attribute value accuracy",
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        "m": {
          "label": "Attribute value accuracy explanation",
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        "n": {
          "label": "Attribute measurement frequency",
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          "label": "Entity and attribute overview",
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        "p": {
          "label": "Entity and attribute detail citation",
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          "label": "Uniform Resource Identifier",
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          "label": "Display note",
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        "6": {
          "label": "Linkage",
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        "label": "Display constant controller",
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          "label": "Field link and sequence number",
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          "label": "Time of collation (NR) [OBSOLETE, 1997]"
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          "label": "Field link and sequence number",
          "repeatable": true
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          "label": "Source of note information [OBSOLETE, 1990]"
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        "label": "Display constant controller",
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            "label": "No display constant generated"
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          "label": "International Standard Book Number",
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          "label": "Materials specified",
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          "label": "Linkage",
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          "label": "Field link and sequence number",
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            "label": "Not private"
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          "label": "Action identification",
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          "label": "Time/date of action",
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          "label": "Action interval",
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          "label": "Contingency for action",
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        "f": {
          "label": "Authorization",
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        "h": {
          "label": "Jurisdiction",
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        "i": {
          "label": "Method of action",
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          "label": "Site of action",
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        "k": {
          "label": "Action agent",
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          "label": "Extent",
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          "label": "Type of unit",
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          "label": "Public note",
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          "label": "Institution to which field applies",
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          "label": "Linkage",
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          "label": "Field link and sequence number",
          "repeatable": true
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      "tag": "584",
      "label": "Accumulation and Frequency of Use Note",
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      "indicator1": null,
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          "label": "Materials specified",
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        "5": {
          "label": "Institution to which field applies",
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          "label": "Linkage",
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        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
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      }
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      "tag": "585",
      "label": "Exhibitions Note",
      "url": "https://www.loc.gov/marc/bibliographic/bd585.html",
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      "indicator1": null,
      "indicator2": null,
      "subfields": {
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          "label": "Exhibitions note",
          "repeatable": false
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        "3": {
          "label": "Materials specified",
          "repeatable": false
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        "5": {
          "label": "Institution to which field applies",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
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        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
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      }
    },
    "586": {
      "tag": "586",
      "label": "Awards Note",
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      "indicator1": {
        "label": "Display constant controller",
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            "label": "Awards"
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            "label": "No display constant generated"
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          "label": "Awards note",
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          "label": "Materials specified",
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        "6": {
          "label": "Linkage",
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        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
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      "indicator1": {
        "label": "Display constant controller",
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            "label": "No information provided"
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            "label": "Source of description"
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            "label": "Latest issue consulted"
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          "label": "Institution to which field applies",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
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      }
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    "600": {
      "tag": "600",
      "label": "Subject Added Entry - Personal Name",
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            "label": "Surname"
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            "label": "Family name"
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        "historical-codes": {
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            "label": "Multiple surname [OBSOLETE, 1996]"
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            "label": "Library of Congress Subject Headings"
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            "label": "LC subject headings for children's literature"
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            "label": "Medical Subject Headings"
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          "3": {
            "label": "National Agricultural Library subject authority file"
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            "label": "Source not specified"
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          "5": {
            "label": "Canadian Subject Headings"
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          "6": {
            "label": "Répertoire de vedettes-matière"
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            "label": "Source specified in subfield $2"
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      "subfields": {
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          "label": "Personal name",
          "repeatable": false
        },
        "b": {
          "label": "Numeration",
          "repeatable": false
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        "c": {
          "label": "Titles and other words associated with a name",
          "repeatable": true
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        "d": {
          "label": "Dates associated with a name",
          "repeatable": false
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        "e": {
          "label": "Relator term",
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        "f": {
          "label": "Date of a work",
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          "label": "Miscellaneous information",
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        "h": {
          "label": "Medium",
          "repeatable": false
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        "j": {
          "label": "Attribution qualifier",
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        "k": {
          "label": "Form subheading",
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        "l": {
          "label": "Language of a work",
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        "m": {
          "label": "Medium of performance for music",
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        },
        "n": {
          "label": "Number of part/section of a work",
          "repeatable": true
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        "o": {
          "label": "Arranged statement for music",
          "repeatable": false
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        "p": {
          "label": "Name of part/section of a work",
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          "label": "Fuller form of name",
          "repeatable": false
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        "r": {
          "label": "Key for music",
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        "s": {
          "label": "Version",
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        },
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          "label": "Title of a work",
          "repeatable": false
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        "u": {
          "label": "Affiliation",
          "repeatable": false
        },
        "v": {
          "label": "Form subdivision",
          "repeatable": true
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        "x": {
          "label": "General subdivision",
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        "y": {
          "label": "Chronological subdivision",
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          "label": "Geographic subdivision",
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          "label": "Authority record control number or standard number",
          "repeatable": true
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        "2": {
          "label": "Source of heading or term",
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          "codelist": {
            "name": "Subject Heading and Term Source Codes",
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          "label": "Materials specified",
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        "4": {
          "label": "Relationship",
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          "codelist": {
            "name": "MARC Code List for Relators",
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          "label": "Field link and sequence number",
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      "label": "Subject Added Entry - Corporate Name",
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            "label": "Inverted name"
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            "label": "Jurisdiction name"
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          "2": {
            "label": "Name in direct order"
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            "label": "Source not specified"
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            "label": "Canadian Subject Headings"
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            "label": "Répertoire de vedettes-matière"
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            "label": "Source specified in subfield $2"
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          "label": "Corporate name or jurisdiction name as entry element",
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        "b": {
          "label": "Subordinate unit",
          "repeatable": true
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        "c": {
          "label": "Location of meeting",
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        "d": {
          "label": "Date of meeting or treaty signing",
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          "label": "Relator term",
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        "f": {
          "label": "Date of a work",
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          "label": "Miscellaneous information",
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          "label": "Medium",
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          "label": "Form subheading",
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        "l": {
          "label": "Language of a work",
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        "m": {
          "label": "Medium of performance for music",
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        },
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          "label": "Arranged statement for music",
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        "p": {
          "label": "Name of part/section of a work",
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        },
        "r": {
          "label": "Key for music",
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        "s": {
          "label": "Version",
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          "label": "Source of heading or term",
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          "label": "Materials specified",
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            "label": "Répertoire de vedettes-matière"
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          "label": "Form subheading",
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          "label": "Date of treaty signing",
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          "label": "Medium of performance for music",
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        },
        "2": {
          "label": "Source of term",
          "repeatable": false,
          "codelist": {
            "name": "Function Term Source Codes",
            "url": "http://www.loc.gov/standards/sourcelist/function.html"
          }
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "658": {
      "tag": "658",
      "label": "Index Term - Curriculum Objective",
      "url": "https://www.loc.gov/marc/bibliographic/bd658.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Main curriculum objective",
          "repeatable": false
        },
        "b": {
          "label": "Subordinate curriculum objective",
          "repeatable": true
        },
        "c": {
          "label": "Curriculum code",
          "repeatable": false
        },
        "d": {
          "label": "Correlation factor",
          "repeatable": false
        },
        "2": {
          "label": "Source of term or code",
          "repeatable": false,
          "codelist": {
            "name": "Curriculum Objective Term and Code Source Codes",
            "url": "http://www.loc.gov/standards/sourcelist/curriculum-objective.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "662": {
      "tag": "662",
      "label": "Subject Added Entry - Hierarchical Place Name",
      "url": "https://www.loc.gov/marc/bibliographic/bd662.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Country or larger entity",
          "repeatable": true
        },
        "b": {
          "label": "First-order political jurisdiction",
          "repeatable": false
        },
        "c": {
          "label": "Intermediate political jurisdiction",
          "repeatable": true
        },
        "d": {
          "label": "City",
          "repeatable": false
        },
        "e": {
          "label": "Relator term",
          "repeatable": true
        },
        "f": {
          "label": "City subsection",
          "repeatable": true
        },
        "g": {
          "label": "Other nonjurisdictional geographic region and feature",
          "repeatable": true
        },
        "h": {
          "label": "Extraterrestrial area",
          "repeatable": true
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "2": {
          "label": "Source of heading or term",
          "repeatable": false,
          "codelist": {
            "name": "Subject Heading and Term Source Codes",
            "url": "http://www.loc.gov/standards/sourcelist/subject.html"
          }
        },
        "4": {
          "label": "Relationship",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Relators",
            "url": "https://www.loc.gov/marc/relators/relaterm.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "700": {
      "tag": "700",
      "label": "Added Entry - Personal Name",
      "url": "https://www.loc.gov/marc/bibliographic/bd700.html",
      "repeatable": true,
      "indicator1": {
        "label": "Type of personal name entry element",
        "codes": {
          "0": {
            "label": "Forename"
          },
          "1": {
            "label": "Surname"
          },
          "3": {
            "label": "Family name"
          }
        }
      },
      "indicator2": {
        "label": "Type of added entry",
        "codes": {
          " ": {
            "label": "No information provided"
          },
          "2": {
            "label": "Analytical entry"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Personal name",
          "repeatable": false
        },
        "b": {
          "label": "Numeration",
          "repeatable": false
        },
        "c": {
          "label": "Titles and other words associated with a name",
          "repeatable": true
        },
        "d": {
          "label": "Dates associated with a name",
          "repeatable": false
        },
        "e": {
          "label": "Relator term",
          "repeatable": true
        },
        "f": {
          "label": "Date of a work",
          "repeatable": false
        },
        "g": {
          "label": "Miscellaneous information",
          "repeatable": true
        },
        "h": {
          "label": "Medium",
          "repeatable": false
        },
        "i": {
          "label": "Relationship information",
          "repeatable": true
        },
        "j": {
          "label": "Attribution qualifier",
          "repeatable": true
        },
        "k": {
          "label": "Form subheading",
          "repeatable": true
        },
        "l": {
          "label": "Language of a work",
          "repeatable": false
        },
        "m": {
          "label": "Medium of performance for music",
          "repeatable": true
        },
        "n": {
          "label": "Number of part/section of a work",
          "repeatable": true
        },
        "o": {
          "label": "Arranged statement for music",
          "repeatable": false
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "q": {
          "label": "Fuller form of name",
          "repeatable": false
        },
        "r": {
          "label": "Key for music",
          "repeatable": false
        },
        "s": {
          "label": "Version",
          "repeatable": false
        },
        "t": {
          "label": "Title of a work",
          "repeatable": false
        },
        "u": {
          "label": "Affiliation",
          "repeatable": false
        },
        "x": {
          "label": "International Standard Serial Number",
          "repeatable": false
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
        },
        "4": {
          "label": "Relationship",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Relators",
            "url": "https://www.loc.gov/marc/relators/relaterm.html"
          }
        },
        "5": {
          "label": "Institution to which field applies",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "710": {
      "tag": "710",
      "label": "Added Entry - Corporate Name",
      "url": "https://www.loc.gov/marc/bibliographic/bd710.html",
      "repeatable": true,
      "indicator1": {
        "label": "Type of corporate name entry element",
        "codes": {
          "0": {
            "label": "Inverted name"
          },
          "1": {
            "label": "Jurisdiction name"
          },
          "2": {
            "label": "Name in direct order"
          }
        }
      },
      "indicator2": {
        "label": "Type of added entry",
        "codes": {
          " ": {
            "label": "No information provided"
          },
          "2": {
            "label": "Analytical entry"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Corporate name or jurisdiction name as entry element",
          "repeatable": false
        },
        "b": {
          "label": "Subordinate unit",
          "repeatable": true
        },
        "c": {
          "label": "Location of meeting",
          "repeatable": true
        },
        "d": {
          "label": "Date of meeting or treaty signing",
          "repeatable": true
        },
        "e": {
          "label": "Relator term",
          "repeatable": true
        },
        "f": {
          "label": "Date of a work",
          "repeatable": false
        },
        "g": {
          "label": "Miscellaneous information",
          "repeatable": true
        },
        "h": {
          "label": "Medium",
          "repeatable": false
        },
        "i": {
          "label": "Relationship information",
          "repeatable": true
        },
        "k": {
          "label": "Form subheading",
          "repeatable": true
        },
        "l": {
          "label": "Language of a work",
          "repeatable": false
        },
        "m": {
          "label": "Medium of performance for music",
          "repeatable": true
        },
        "n": {
          "label": "Number of part/section/meeting",
          "repeatable": true
        },
        "o": {
          "label": "Arranged statement for music",
          "repeatable": false
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "r": {
          "label": "Key for music",
          "repeatable": false
        },
        "s": {
          "label": "Version",
          "repeatable": false
        },
        "t": {
          "label": "Title of a work",
          "repeatable": false
        },
        "u": {
          "label": "Affiliation",
          "repeatable": false
        },
        "x": {
          "label": "International Standard Serial Number",
          "repeatable": false
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
        },
        "4": {
          "label": "Relationship",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Relators",
            "url": "https://www.loc.gov/marc/relators/relaterm.html"
          }
        },
        "5": {
          "label": "Institution to which field applies",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "711": {
      "tag": "711",
      "label": "Added Entry - Meeting Name",
      "url": "https://www.loc.gov/marc/bibliographic/bd711.html",
      "repeatable": true,
      "indicator1": {
        "label": "Type of meeting name entry element",
        "codes": {
          "0": {
            "label": "Inverted name"
          },
          "1": {
            "label": "Jurisdiction name"
          },
          "2": {
            "label": "Name in direct order"
          }
        }
      },
      "indicator2": {
        "label": "Type of added entry",
        "codes": {
          " ": {
            "label": "No information provided"
          },
          "2": {
            "label": "Analytical entry"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Meeting name or jurisdiction name as entry element",
          "repeatable": false
        },
        "c": {
          "label": "Location of meeting",
          "repeatable": true
        },
        "d": {
          "label": "Date of meeting",
          "repeatable": false
        },
        "e": {
          "label": "Subordinate unit",
          "repeatable": true
        },
        "f": {
          "label": "Date of a work",
          "repeatable": false
        },
        "g": {
          "label": "Miscellaneous information",
          "repeatable": true
        },
        "h": {
          "label": "Medium",
          "repeatable": false
        },
        "i": {
          "label": "Relationship information",
          "repeatable": true
        },
        "j": {
          "label": "Relator term",
          "repeatable": true
        },
        "k": {
          "label": "Form subheading",
          "repeatable": true
        },
        "l": {
          "label": "Language of a work",
          "repeatable": false
        },
        "n": {
          "label": "Number of part/section/meeting",
          "repeatable": true
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "q": {
          "label": "Name of meeting following jurisdiction name entry element",
          "repeatable": false
        },
        "s": {
          "label": "Version",
          "repeatable": false
        },
        "t": {
          "label": "Title of a work",
          "repeatable": false
        },
        "u": {
          "label": "Affiliation",
          "repeatable": false
        },
        "x": {
          "label": "International Standard Serial Number",
          "repeatable": false
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
        },
        "4": {
          "label": "Relationship",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Relators",
            "url": "https://www.loc.gov/marc/relators/relaterm.html"
          }
        },
        "5": {
          "label": "Institution to which field applies",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "720": {
      "tag": "720",
      "label": "Added Entry - Uncontrolled Name",
      "url": "https://www.loc.gov/marc/bibliographic/bd720.html",
      "repeatable": true,
      "indicator1": {
        "label": "Type of name",
        "codes": {
          " ": {
            "label": "Not specified"
          },
          "1": {
            "label": "Personal"
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          "2": {
            "label": "Other"
          }
        }
      },
      "indicator2": null,
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        "a": {
          "label": "Name",
          "repeatable": false
        },
        "e": {
          "label": "Relator term",
          "repeatable": true
        },
        "4": {
          "label": "Relationship",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Relators",
            "url": "https://www.loc.gov/marc/relators/relaterm.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "730": {
      "tag": "730",
      "label": "Added Entry - Uniform Title",
      "url": "https://www.loc.gov/marc/bibliographic/bd730.html",
      "repeatable": true,
      "indicator1": {
        "label": "Nonfiling characters",
        "codes": {
          "0-9": {
            "label": "Number of nonfiling characters"
          }
        }
      },
      "indicator2": {
        "label": "Type of added entry",
        "codes": {
          " ": {
            "label": "No information provided"
          },
          "2": {
            "label": "Analytical entry"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Uniform title",
          "repeatable": false
        },
        "d": {
          "label": "Date of treaty signing",
          "repeatable": true
        },
        "f": {
          "label": "Date of a work",
          "repeatable": false
        },
        "g": {
          "label": "Miscellaneous information",
          "repeatable": true
        },
        "h": {
          "label": "Medium",
          "repeatable": false
        },
        "i": {
          "label": "Relationship information",
          "repeatable": true
        },
        "k": {
          "label": "Form subheading",
          "repeatable": true
        },
        "l": {
          "label": "Language of a work",
          "repeatable": false
        },
        "m": {
          "label": "Medium of performance for music",
          "repeatable": true
        },
        "n": {
          "label": "Number of part/section of a work",
          "repeatable": true
        },
        "o": {
          "label": "Arranged statement for music",
          "repeatable": false
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "r": {
          "label": "Key for music",
          "repeatable": false
        },
        "s": {
          "label": "Version",
          "repeatable": false
        },
        "t": {
          "label": "Title of a work",
          "repeatable": false
        },
        "x": {
          "label": "International Standard Serial Number",
          "repeatable": false
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
        },
        "5": {
          "label": "Institution to which field applies",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "740": {
      "tag": "740",
      "label": "Added Entry - Uncontrolled Related/Analytical Title",
      "url": "https://www.loc.gov/marc/bibliographic/bd740.html",
      "repeatable": true,
      "indicator1": {
        "label": "Nonfiling characters",
        "codes": {
          "0": {
            "label": "No nonfiling characters"
          },
          "1-9": {
            "label": "Number of nonfiling characters"
          }
        },
        "historical-codes": {
          " ": {
            "label": "Nonfiling characters not specified [OBSOLETE, 1980]"
          }
        }
      },
      "indicator2": {
        "label": "Type of added entry",
        "codes": {
          " ": {
            "label": "No information provided"
          },
          "2": {
            "label": "Analytical entry"
          }
        },
        "historical-codes": {
          "0": {
            "label": "Alternative entry (BK, AM, CF, MP, MU) [OBSOLETE, 1993]"
          },
          "1": {
            "label": "Secondary entry (BK, AM, CF, MP, MU) / Printed on card (VM) [OBSOLETE, 1993]"
          },
          "3": {
            "label": "Not printed on card [OBSOLETE, 1993]"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Uncontrolled related/analytical title",
          "repeatable": false
        },
        "h": {
          "label": "Medium",
          "repeatable": false
        },
        "n": {
          "label": "Number of part/section of a work",
          "repeatable": true
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "5": {
          "label": "Institution to which field applies",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "751": {
      "tag": "751",
      "label": "Added Entry - Geographic Name",
      "url": "https://www.loc.gov/marc/bibliographic/bd751.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Geographic name",
          "repeatable": false
        },
        "e": {
          "label": "Relator term",
          "repeatable": true
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "2": {
          "label": "Source of heading or term",
          "repeatable": false,
          "codelist": {
            "name": "Name and Title Authority Source Codes",
            "url": "https://www.loc.gov/standards/sourcelist/name-title.html"
          }
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
        },
        "4": {
          "label": "Relationship",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Relators",
            "url": "https://www.loc.gov/marc/relators/relaterm.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "752": {
      "tag": "752",
      "label": "Added Entry - Hierarchical Place Name",
      "url": "https://www.loc.gov/marc/bibliographic/bd752.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Country or larger entity",
          "repeatable": true
        },
        "b": {
          "label": "First-order political jurisdiction",
          "repeatable": false
        },
        "c": {
          "label": "Intermediate political jurisdiction",
          "repeatable": true
        },
        "d": {
          "label": "City",
          "repeatable": false
        },
        "e": {
          "label": "Relator term",
          "repeatable": true
        },
        "f": {
          "label": "City subsection",
          "repeatable": true
        },
        "g": {
          "label": "Other nonjurisdictional geographic region and feature",
          "repeatable": true
        },
        "h": {
          "label": "Extraterrestrial area",
          "repeatable": true
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "2": {
          "label": "Source of heading or term",
          "repeatable": false,
          "codelist": {
            "name": "Name and Title Authority Source Codes",
            "url": "https://www.loc.gov/standards/sourcelist/name-title.html"
          }
        },
        "4": {
          "label": "Relationship",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Relators",
            "url": "https://www.loc.gov/marc/relators/relaterm.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "753": {
      "tag": "753",
      "label": "System Details Access to Computer Files",
      "url": "https://www.loc.gov/marc/bibliographic/bd753.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Make and model of machine",
          "repeatable": false
        },
        "b": {
          "label": "Programming language",
          "repeatable": false
        },
        "c": {
          "label": "Operating system",
          "repeatable": false
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "2": {
          "label": "Source of term",
          "repeatable": false,
          "codelist": {
            "name": "Subject Heading and Term Source Codes",
            "url": "http://www.loc.gov/standards/sourcelist/subject.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "754": {
      "tag": "754",
      "label": "Added Entry - Taxonomic Identification",
      "url": "https://www.loc.gov/marc/bibliographic/bd754.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Taxonomic name",
          "repeatable": true
        },
        "c": {
          "label": "Taxonomic category",
          "repeatable": true
        },
        "d": {
          "label": "Common or alternative name",
          "repeatable": true
        },
        "x": {
          "label": "Non-public note",
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          "label": "Bibliographic record control number",
          "repeatable": true
        },
        "x": {
          "label": "International Standard Serial Number",
          "repeatable": false
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
        },
        "4": {
          "label": "Relationship",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Relators",
            "url": "https://www.loc.gov/marc/relators/relaterm.html"
          }
        },
        "5": {
          "label": "Institution to which field applies",
          "repeatable": true
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "7": {
          "label": "Control subfield",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "810": {
      "tag": "810",
      "label": "Series Added Entry - Corporate Name",
      "url": "https://www.loc.gov/marc/bibliographic/bd810.html",
      "repeatable": true,
      "indicator1": {
        "label": "Type of corporate name entry element",
        "codes": {
          "0": {
            "label": "Inverted name"
          },
          "1": {
            "label": "Jurisdiction name"
          },
          "2": {
            "label": "Name in direct order"
          }
        }
      },
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Corporate name or jurisdiction name as entry element",
          "repeatable": false
        },
        "b": {
          "label": "Subordinate unit",
          "repeatable": true
        },
        "c": {
          "label": "Location of meeting",
          "repeatable": true
        },
        "d": {
          "label": "Date of meeting or treaty signing",
          "repeatable": true
        },
        "e": {
          "label": "Relator term",
          "repeatable": true
        },
        "f": {
          "label": "Date of a work",
          "repeatable": false
        },
        "g": {
          "label": "Miscellaneous information",
          "repeatable": true
        },
        "h": {
          "label": "Medium",
          "repeatable": false
        },
        "k": {
          "label": "Form subheading",
          "repeatable": true
        },
        "l": {
          "label": "Language of a work",
          "repeatable": false
        },
        "m": {
          "label": "Medium of performance for music",
          "repeatable": true
        },
        "n": {
          "label": "Number of part/section/meeting",
          "repeatable": true
        },
        "o": {
          "label": "Arranged statement for music",
          "repeatable": false
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "r": {
          "label": "Key for music",
          "repeatable": false
        },
        "s": {
          "label": "Version",
          "repeatable": false
        },
        "t": {
          "label": "Title of a work",
          "repeatable": false
        },
        "u": {
          "label": "Affiliation",
          "repeatable": false
        },
        "v": {
          "label": "Volume/sequential designation",
          "repeatable": false
        },
        "w": {
          "label": "Bibliographic record control number",
          "repeatable": true
        },
        "x": {
          "label": "International Standard Serial Number",
          "repeatable": false
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
        },
        "4": {
          "label": "Relationship",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Relators",
            "url": "https://www.loc.gov/marc/relators/relaterm.html"
          }
        },
        "5": {
          "label": "Institution to which field applies",
          "repeatable": true
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "7": {
          "label": "Control subfield",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "811": {
      "tag": "811",
      "label": "Series Added Entry - Meeting Name",
      "url": "https://www.loc.gov/marc/bibliographic/bd811.html",
      "repeatable": true,
      "indicator1": {
        "label": "Type of meeting name entry element",
        "codes": {
          "0": {
            "label": "Inverted name"
          },
          "1": {
            "label": "Jurisdiction name"
          },
          "2": {
            "label": "Name in direct order"
          }
        }
      },
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Meeting name or jurisdiction name as entry element",
          "repeatable": false
        },
        "c": {
          "label": "Location of meeting",
          "repeatable": true
        },
        "d": {
          "label": "Date of meeting",
          "repeatable": false
        },
        "e": {
          "label": "Subordinate unit",
          "repeatable": true
        },
        "f": {
          "label": "Date of a work",
          "repeatable": false
        },
        "g": {
          "label": "Miscellaneous information",
          "repeatable": true
        },
        "h": {
          "label": "Medium",
          "repeatable": false
        },
        "j": {
          "label": "Relator term",
          "repeatable": true
        },
        "k": {
          "label": "Form subheading",
          "repeatable": true
        },
        "l": {
          "label": "Language of a work",
          "repeatable": false
        },
        "n": {
          "label": "Number of part/section/meeting",
          "repeatable": true
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "q": {
          "label": "Name of meeting following jurisdiction name entry element",
          "repeatable": false
        },
        "s": {
          "label": "Version",
          "repeatable": false
        },
        "t": {
          "label": "Title of a work",
          "repeatable": false
        },
        "u": {
          "label": "Affiliation",
          "repeatable": false
        },
        "v": {
          "label": "Volume/sequential designation",
          "repeatable": false
        },
        "w": {
          "label": "Bibliographic record control number",
          "repeatable": true
        },
        "x": {
          "label": "International Standard Serial Number",
          "repeatable": false
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
        },
        "4": {
          "label": "Relationship",
          "repeatable": true,
          "codelist": {
            "name": "MARC Code List for Relators",
            "url": "https://www.loc.gov/marc/relators/relaterm.html"
          }
        },
        "5": {
          "label": "Institution to which field applies",
          "repeatable": true
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "7": {
          "label": "Control subfield",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "830": {
      "tag": "830",
      "label": "Series Added Entry - Uniform Title",
      "url": "https://www.loc.gov/marc/bibliographic/bd830.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": {
        "label": "Nonfiling characters",
        "codes": {
          "0": {
            "label": "No nonfiling characters"
          },
          "1-9": {
            "label": "Number of nonfiling characters"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Uniform title",
          "repeatable": false
        },
        "d": {
          "label": "Date of treaty signing",
          "repeatable": true
        },
        "f": {
          "label": "Date of a work",
          "repeatable": false
        },
        "g": {
          "label": "Miscellaneous information",
          "repeatable": true
        },
        "h": {
          "label": "Medium",
          "repeatable": false
        },
        "k": {
          "label": "Form subheading",
          "repeatable": true
        },
        "l": {
          "label": "Language of a work",
          "repeatable": false
        },
        "m": {
          "label": "Medium of performance for music",
          "repeatable": true
        },
        "n": {
          "label": "Number of part/section of a work",
          "repeatable": true
        },
        "o": {
          "label": "Arranged statement for music",
          "repeatable": false
        },
        "p": {
          "label": "Name of part/section of a work",
          "repeatable": true
        },
        "r": {
          "label": "Key for music",
          "repeatable": false
        },
        "s": {
          "label": "Version",
          "repeatable": false
        },
        "t": {
          "label": "Title of a work",
          "repeatable": false
        },
        "v": {
          "label": "Volume/sequential designation",
          "repeatable": false
        },
        "w": {
          "label": "Bibliographic record control number",
          "repeatable": true
        },
        "x": {
          "label": "International Standard Serial Number",
          "repeatable": false
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
        },
        "5": {
          "label": "Institution to which field applies",
          "repeatable": true
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "7": {
          "label": "Control subfield",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "850": {
      "tag": "850",
      "label": "Holding Institution",
      "url": "https://www.loc.gov/marc/bibliographic/bd850.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Holding institution",
          "repeatable": true,
          "codelist": {
            "name": "MARC Organization Codes",
            "url": "http://www.loc.gov/marc/organizations/orgshome.html"
          }
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      },
      "historical-subfields": {
        "b": {
          "label": "Holdings (MU, VM, SE) [OBSOLETE, 1990]"
        },
        "d": {
          "label": "Inclusive dates (MU, VM, SE) [OBSOLETE, 1990]"
        },
        "e": {
          "label": "Retention statement (CF, MU, VM, SE) [OBSOLETE, 1990]"
        }
      }
    },
    "852": {
      "tag": "852",
      "label": "Location",
      "url": "https://www.loc.gov/marc/bibliographic/bd852.html",
      "repeatable": true,
      "indicator1": {
        "label": "Shelving scheme",
        "codes": {
          " ": {
            "label": "No information provided"
          },
          "0": {
            "label": "Library of Congress classification"
          },
          "1": {
            "label": "Dewey Decimal classification"
          },
          "2": {
            "label": "National Library of Medicine classification"
          },
          "3": {
            "label": "Superintendent of Documents classification"
          },
          "4": {
            "label": "Shelving control number"
          },
          "5": {
            "label": "Title"
          },
          "6": {
            "label": "Shelved separately"
          },
          "7": {
            "label": "Source specified in subfield $2"
          },
          "8": {
            "label": "Other scheme"
          }
        }
      },
      "indicator2": {
        "label": "Shelving order",
        "codes": {
          " ": {
            "label": "No information provided"
          },
          "0": {
            "label": "Not enumeration"
          },
          "1": {
            "label": "Primary enumeration"
          },
          "2": {
            "label": "Alternative enumeration"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Location",
          "repeatable": false,
          "codelist": {
            "name": "MARC Organization Codes",
            "url": "http://www.loc.gov/marc/organizations/orgshome.html"
          }
        },
        "b": {
          "label": "Sublocation or collection",
          "repeatable": true
        },
        "c": {
          "label": "Shelving location",
          "repeatable": true
        },
        "d": {
          "label": "Former shelving location",
          "repeatable": true
        },
        "e": {
          "label": "Address",
          "repeatable": true
        },
        "f": {
          "label": "Coded location qualifier",
          "repeatable": true
        },
        "g": {
          "label": "Non-coded location qualifier",
          "repeatable": true
        },
        "h": {
          "label": "Classification part",
          "repeatable": false
        },
        "i": {
          "label": "Item part",
          "repeatable": true
        },
        "j": {
          "label": "Shelving control number",
          "repeatable": false
        },
        "k": {
          "label": "Call number prefix",
          "repeatable": true
        },
        "l": {
          "label": "Shelving form of title",
          "repeatable": false
        },
        "m": {
          "label": "Call number suffix",
          "repeatable": true
        },
        "n": {
          "label": "Country code",
          "repeatable": false,
          "codelist": {
            "name": "MARC Code List for Countries",
            "url": "http://www.loc.gov/marc/countries/countries_code.html"
          }
        },
        "p": {
          "label": "Piece designation",
          "repeatable": false
        },
        "q": {
          "label": "Piece physical condition",
          "repeatable": false
        },
        "s": {
          "label": "Copyright article-fee code",
          "repeatable": true
        },
        "t": {
          "label": "Copy number",
          "repeatable": false
        },
        "u": {
          "label": "Uniform Resource Identifier",
          "repeatable": true
        },
        "x": {
          "label": "Nonpublic note",
          "repeatable": true
        },
        "z": {
          "label": "Public note",
          "repeatable": true
        },
        "2": {
          "label": "Source of classification or shelving scheme",
          "repeatable": false,
          "codelist": {
            "name": "Classification Scheme Source Codes",
            "url": "http://www.loc.gov/standards/sourcelist/classification.html"
          }
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "856": {
      "tag": "856",
      "label": "Electronic Location and Access",
      "url": "https://www.loc.gov/marc/bibliographic/bd856.html",
      "repeatable": true,
      "indicator1": {
        "label": "Access method",
        "codes": {
          " ": {
            "label": "No information provided"
          },
          "0": {
            "label": "Email"
          },
          "1": {
            "label": "FTP"
          },
          "2": {
            "label": "Remote login (Telnet)"
          },
          "3": {
            "label": "Dial-up"
          },
          "4": {
            "label": "HTTP"
          },
          "7": {
            "label": "Method specified in subfield $2"
          }
        }
      },
      "indicator2": {
        "label": "Relationship",
        "codes": {
          " ": {
            "label": "No information provided"
          },
          "0": {
            "label": "Resource"
          },
          "1": {
            "label": "Version of resource"
          },
          "2": {
            "label": "Related resource"
          },
          "8": {
            "label": "No display constant generated"
          }
        }
      },
      "subfields": {
        "a": {
          "label": "Host name",
          "repeatable": true
        },
        "b": {
          "label": "Access number",
          "repeatable": true
        },
        "c": {
          "label": "Compression information",
          "repeatable": true
        },
        "d": {
          "label": "Path",
          "repeatable": true
        },
        "f": {
          "label": "Electronic name",
          "repeatable": true
        },
        "h": {
          "label": "Processor of request",
          "repeatable": false
        },
        "i": {
          "label": "Instruction",
          "repeatable": true
        },
        "j": {
          "label": "Bits per second",
          "repeatable": false
        },
        "k": {
          "label": "Password",
          "repeatable": false
        },
        "l": {
          "label": "Logon",
          "repeatable": false
        },
        "m": {
          "label": "Contact for access assistance",
          "repeatable": true
        },
        "n": {
          "label": "Name of location of host",
          "repeatable": false
        },
        "o": {
          "label": "Operating system",
          "repeatable": false
        },
        "p": {
          "label": "Port",
          "repeatable": false
        },
        "q": {
          "label": "Electronic format type",
          "repeatable": false
        },
        "r": {
          "label": "Settings",
          "repeatable": false
        },
        "s": {
          "label": "File size",
          "repeatable": true
        },
        "t": {
          "label": "Terminal emulation",
          "repeatable": true
        },
        "u": {
          "label": "Uniform Resource Identifier",
          "repeatable": true
        },
        "v": {
          "label": "Hours access method available",
          "repeatable": true
        },
        "w": {
          "label": "Record control number",
          "repeatable": true,
          "codelist": {
            "name": "MARC Organization Codes",
            "url": "http://www.loc.gov/marc/organizations/orgshome.html"
          }
        },
        "x": {
          "label": "Nonpublic note",
          "repeatable": true
        },
        "y": {
          "label": "Link text",
          "repeatable": true
        },
        "z": {
          "label": "Public note",
          "repeatable": true
        },
        "2": {
          "label": "Access method",
          "repeatable": false,
          "codelist": {
            "name": "Electronic Access Methods Code List",
            "url": "http://www.loc.gov/standards/valuelist/electronaccess.html"
          }
        },
        "3": {
          "label": "Materials specified",
          "repeatable": false
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      },
      "historical-subfields": {
        "g": {
          "label": "Uniform Resource Name [OBSOLETE, 2000]"
        }
      }
    },
    "880": {
      "tag": "880",
      "label": "Alternate Graphic Representation",
      "url": "https://www.loc.gov/marc/bibliographic/bd880.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "a": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "b": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "c": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "d": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "e": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "f": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "g": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "h": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "i": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "j": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "k": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "l": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "m": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "n": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "o": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "p": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "q": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "r": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "s": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "t": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "u": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "v": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "w": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "x": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "y": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "z": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "0": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "1": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "2": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "3": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "4": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "5": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "7": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "8": {
          "label": "Same as associated field",
          "repeatable": true
        },
        "9": {
          "label": "Same as associated field",
          "repeatable": true
        }
      }
    },
    "882": {
      "tag": "882",
      "label": "Replacement Record Information",
      "url": "https://www.loc.gov/marc/bibliographic/bd882.html",
      "repeatable": false,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Replacement title",
          "repeatable": true
        },
        "i": {
          "label": "Explanatory text",
          "repeatable": true
        },
        "w": {
          "label": "Replacement bibliographic record control number",
          "repeatable": true,
          "codelist": {
            "name": "MARC Organization Codes",
            "url": "http://www.loc.gov/marc/organizations/orgshome.html"
          }
        },
        "6": {
          "label": "Linkage",
          "repeatable": false
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "883": {
      "tag": "883",
      "label": "Machine-generated Metadata Provenance",
      "url": "https://www.loc.gov/marc/bibliographic/bd883.html",
      "repeatable": true,
      "indicator1": {
        "label": "Method of machine assignment",
        "codes": {
          " ": {
            "label": "No information provided/not applicable"
          },
          "0": {
            "label": "Fully machine-generated"
          },
          "1": {
            "label": "Partially machine-generated"
          }
        }
      },
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Generation process",
          "repeatable": false
        },
        "c": {
          "label": "Confidence value",
          "repeatable": false
        },
        "d": {
          "label": "Generation date",
          "repeatable": false
        },
        "q": {
          "label": "Generation agency",
          "repeatable": false,
          "codelist": {
            "name": "MARC Organization Codes",
            "url": "http://www.loc.gov/marc/organizations/orgshome.html"
          }
        },
        "x": {
          "label": "Validity end date",
          "repeatable": false
        },
        "u": {
          "label": "Uniform Resource Identifier",
          "repeatable": false
        },
        "w": {
          "label": "Bibliographic record control number",
          "repeatable": true
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "8": {
          "label": "Field link and sequence number",
          "repeatable": true
        }
      }
    },
    "884": {
      "tag": "884",
      "label": "Description Conversion Information",
      "url": "https://www.loc.gov/marc/bibliographic/bd884.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Conversion process",
          "repeatable": false
        },
        "g": {
          "label": "Conversion date",
          "repeatable": false
        },
        "k": {
          "label": "Identifier of source metadata",
          "repeatable": false
        },
        "q": {
          "label": "Conversion agency",
          "repeatable": false,
          "codelist": {
            "name": "MARC Organization Codes",
            "url": "http://www.loc.gov/marc/organizations/orgshome.html"
          }
        },
        "u": {
          "label": "Uniform Resource Identifier",
          "repeatable": true
        }
      }
    },
    "885": {
      "tag": "885",
      "label": "Matching Information",
      "url": "https://www.loc.gov/marc/bibliographic/bd885.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Matching information",
          "repeatable": false
        },
        "b": {
          "label": "Status of matching and its checking",
          "repeatable": false
        },
        "c": {
          "label": "Confidence value",
          "repeatable": false
        },
        "d": {
          "label": "Generation date",
          "repeatable": false
        },
        "w": {
          "label": "Record control number",
          "repeatable": true
        },
        "x": {
          "label": "Nonpublic note",
          "repeatable": true
        },
        "z": {
          "label": "Public note",
          "repeatable": true
        },
        "0": {
          "label": "Authority record control number or standard number",
          "repeatable": true
        },
        "2": {
          "label": "Source",
          "repeatable": false,
          "codelist": {
            "name": "MARC Organization Codes",
            "url": "http://www.loc.gov/marc/organizations/orgshome.html"
          }
        },
        "5": {
          "label": "Institution to which field applies",
          "repeatable": false
        }
      }
    },
    "886": {
      "tag": "886",
      "label": "Foreign MARC Information Field",
      "url": "https://www.loc.gov/marc/bibliographic/bd886.html",
      "repeatable": true,
      "indicator1": {
        "label": "Type of field",
        "codes": {
          "0": {
            "label": "Leader"
          },
          "1": {
            "label": "Variable control fields (002-009)"
          },
          "2": {
            "label": "Variable data fields (010-999)"
          }
        }
      },
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Tag of the foreign MARC field",
          "repeatable": false
        },
        "b": {
          "label": "Content of the foreign MARC field",
          "repeatable": false
        },
        "2": {
          "label": "Source of data",
          "repeatable": false,
          "codelist": {
            "name": "Format Source Codes",
            "url": "http://www.loc.gov/standards/sourcelist/format.html"
          }
        }
      },
      "historical-subfields": {
        "c": {
          "label": "Content of the foreign MARC control fields 002-009 [OBSOLETE, 1997] [CAN/MARC only]"
        },
        "d": {
          "label": "Content designators and data elements of the foreign MARC variable fields 010-999 [OBSOLETE, 1997] [CAN/MARC only]"
        }
      }
    },
    "887": {
      "tag": "887",
      "label": "Non-MARC Information Field",
      "url": "https://www.loc.gov/marc/bibliographic/bd887.html",
      "repeatable": true,
      "indicator1": null,
      "indicator2": null,
      "subfields": {
        "a": {
          "label": "Content of non-MARC field",
          "repeatable": false
        },
        "2": {
          "label": "Source of data",
          "repeatable": false,
          "codelist": {
            "name": "Format Source Codes",
            "url": "http://www.loc.gov/standards/sourcelist/format.html"
          }
        }
      }
    }
  }
}