This MARC Format Help is prepared by The Library Corporation, Inwood, WV, based on the MARC 21 Format for Authority Data, 1999 Edition, which was prepared by the Network Development and MARC Standards Office, Library of Congress, Washington, DC, in cooperation with Standards, Library and Archives Canada (previously National Library of Canada) and Bibliographic Standards and Systems, British Library.

As updates are issued by the Library of Congress, this MARC Format Help will be updated by The Library Corporation.  For format changes from updates, see Appendix F.  For version information and the current status of this document, see the edition information.

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Authority Data Format:  Introduction