MARC Report 252 adds support for the changes introduced by–

MARC21 Update No. 27--Bibliographic
MARC21 Update No. 27--Authorities

–announced by the Library of Congress in November, 2018.

In addition, MARC Report 252 updates its codelists to include changes added by the following:

• Additions to Source Codes for Vocabularies, Rules, and Schemes (October 26, 2018)

• Additions to Source Codes for Vocabularies, Rules, and Schemes (October 12, 2018)

• Additions to Source Codes for Vocabularies, Rules, and Schemes (September 21, 2018)

• Additions to Source Codes for Vocabularies, Rules, and Schemes (August 31, 2018)

• Additions to Source Codes for Vocabularies, Rules, and Schemes (July 27, 2018)