USMARC format for authority data including guidelines for content designation

Washington [D.C.] Cataloging Distribution Service, Library of Congress 1987 .
1 v. (loose-leaf) , Previously published under title: Authorities, a MARC format. | "This document ... defines the codes and conventions (tags, indicators, subfield codes, and coded values) that identify the data elements in USMARC authority records"--Introd. | June 1987.

National level authority record

Washington, D.C. Library of Congress | Distributed by Cataloging Distribution Service 1982 .
viii, 87 p. , "Based on the first edition of Authorities, a MARC format, 1981"--Introd. 29 cm..

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USMARC format for authority data including guidelines for content designation

National level authority record