MARC 21 Search Indexes

The links below direct users to the sections that identify the mapping of MARC 21 tags to search indexes:

• MARC 21 Bibliographic All Titles Search
• MARC 21 Authority Search Index Mapping
• MARC 21 Keyword Search Indexes
• MARC 21 Holdings Tags and Mapped Search Indexes

To access the search index information for the other metadata standards, see Search Indexes.

Latest MARC 21 Updates

The latest Library of Congress MARC 21 updates added to Alma are these:

• MARC21 BIB
  • Update No. 40, June 2025
• MARC21 Holdings
  • Update No. 40, June 2025
  MARC21 Authorities
  • Update No. 40, June 2025

For information relating to the MARC 21 formats and related code lists published by the Network Development and MARC Standards Office, see http://www.loc.gov/marc/status.html.

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