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- The online book "Understanding MARC Bibliographic: Machine-Readable Cataloging" hosted by the Libray of Congress
- This helpful resource features a description and working examples of the most commonly used MARC Bibliographic and Authority tags as well as sample MARC records.
- Got cataloging questions? Turn to Ms. MARC for expert online answers.
- The CRS is based on 21 MARC manuals and other reference works published by The Library of Congress and frequently accessed by technical services staff.