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MARC 21 Format for Bibliographic Data: Including Guidelines for Content Designation
Network Development and MARC Standards Office, Library of Congress
2009 Cumulation (1999 edition with Updates 1-9 interfiled)
Publication Date:
Free download
Discontinued print product. MARC 21 formats and their updates are available free on the Library of Congress MARC web site.

Here is the standard for representing and exchanging bibliographic data in machine-readable form. Specifies the structure of the MARC bibliographic record, defines the codes and conventions that identify data elements in MARC bibliographic records, describes in detail the use of each content designator, and provides input conventions for each content designator.
Included in Cataloger's Desktop

Related links:
Concise format
MARC Web Site

Introduction to MARC Documentation

Machine-Readable Cataloging (MARC) is the standard in library automation, forming the backbone of today's automated library systems, networks, and bibliographical utilities. The Library of Congress MARC products set the standard for MARC cataloging documentation. Available in Cataloger's Desktop and free online on the Library's MARC web site,

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