Library of Congress

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Library of Congress is one of the major providers of Authority Records. They also maintain the standards regarding Authority records.

Library of Congress is responsible for NACO and SACO records.

About Library of Congress Authorities

  • 265,000 subject authority records
  • 5.3 million name authority records (ca. 3.8 million personal, 900,000 corporate, 120,000 meeting, and 90,000 geographic names)
  • 350,000 series and uniform title authority records
  • 340,000 name/title authority records


The Library of Congress updates and adds new records to their Authority File constantly. They provide updates to both their NACO and SACO records on a weekly basis to vendors.

Backstage Library Works incorporates these weekly files every Wednesday.