The following documents the changes contained in the twenty-first update to the 2000 edition of MARC 21 Format for Holdings Data.  Update No. 21 (September 2015) includes changes resulting from proposals that were considered by the MARC 21 community during June 2015.

New content designators:

Subfield codes

$0  Authority record control number or standard number (R) in Appendix A - Control Subfields

$0  Authority record control number or standard number (R) in 337 (Media Type)

$0  Authority record control number or standard number (R) in 338 (Carrier Type)

See also:

Appendix F:  Format Change Lists

Appendices