043 - Geographic Area Code (R) - Library of Congress
https://www.loc.gov/marc/bibliographic/bd043.html
WebDec 1, 2020 · Choice of geographic area code is usually based on the geographic names and/or subdivisions in 6XX subject added entry and index term fields. GACs are recorded in field 043 in order of importance, which is generally the same order as the geographic names and/or subdivisions in the 6XX fields.
DA: 39 PA: 46 MOZ Rank: 85