MARC country code
MARC is an acronym for MAchine-Readable Cataloging. It defines a bibliographic data format that emerged from a United States Library of Congress-led initiative that began in the 1970s. It provides the mechanism by which computers exchange, use, and interpret bibliographic information, and its data elements make up the foundation of most library catalogs used today. MARC became USMARC in the 1980s and MARC 21 in the late 1990s.
MARC 21 is not a new format. After having discussions and making minor changes to both formats that accommodated USMARC and CAN/MARC users' specific needs, the USMARC and CAN/MARC (Canadian MARC) formats were "harmonized" into MARC 21 in 1997.
The MARC Standards Office is part of the Library of Congress.
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