Superseded Documentation (Introduction)
USMARC Documentation:
MARC 21 supersedes the 1989 edition of USMARC Format for Holdings Data: Including Guidelines for Content Designation and updates No. 1 (April 1991), No. 2 (July 1994), and No. 3 (October 1998) to that edition. The 1989 edition superseded the 1984 edition of the format, which was the first edition, and its 1987 update No. 1.
CAN/MARC Documentation:
MARC 21 supersedes the 1990 edition of Canadian MARC Communication Format: Holdings Data and its one update published in 1992.
See also: