For information about the MARC Authority Data Format, select one of the topics below:




Variable Control Fields  (00X)

Variable Data Fields  (0XX-9XX)



Tag List  (001-999)

Tag List  (A-Z)


RDA in MARC Authority Data


 LC Guidelines


 DCM Z1 Instructions


Shortcut:  Use the Tag Lists to look for a particular MARC field.

See also:

MARC 21 Formats

MARC 21 Format for Bibliographic Data

Cataloger's Reference Shelf


Source:  The information contained in this section of the Cataloger's Reference Shelf is based on MARC 21 Format for Authority Data, Including Guidelines for Content Designation, 1999 Edition, and includes all updates through Update No. 27, November 2018, prepared by the Network Development and MARC Standards Office; Cataloging Distribution Service, Library of Congress, Washington, D.C., in cooperation with Standards, Library and Archives Canada and Bibliographic Development, British Library.  See the disclaimer.

The information contained in the LC Guidelines ("Blue Pages") is based on LC Guidelines Supplement to the MARC 21 Format for Authority Data, 2002 Edition, including updates through August 2017, at

The information contained in the DCM Z1 ("Yellow Pages") is based on Descriptive Cataloging Manual, Z1:  Name and Series Authority Records, a supplement to the MARC 21 Format for Authority Data, including updates through October 2017, at