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The Library of Congress > Cataloging Distribution Service > MARC Documentation > MARC 21 Format for Holdings Data
MARC 21 Format for Holdings Data: Including Guidelines for Content Designation
Network Development and MARC Standards Office, Library of Congress
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Defines the codes and conventions (tags, indicators, subfield codes, and coded values) that identify elements in MARC holdings reports for serial and nonserial items. Important for local and union catalogs, online catalogs, cooperative acquisitions, collection development, preservation programs, national union catalogs, union list activities, and as a link in fully automated interlibrary loan and document delivery systems. Includes examples illustrating proper usage and guidelines for using the format according to American National Standards for Holdings Statements.
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Introduction to MARC Documentation

Machine-Readable Cataloging (MARC) is the standard in library automation. Available in Cataloger's Desktop (

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