National Union Catalog of Manuscript Collections (NUCMC)
NUCMC is an archive search engine operated by the Library of Congress.
The mission of the NUCMC program is to provide and promote bibliographic access to the nation’s documentary heritage. This mission is realized by NUCMC production of cataloging describing archival and manuscript collections held by eligible repositories located throughout the United States and its territories. The program’s mission is further realized by the provision of free searching, via NUCMC gateways, of archival and manuscript cataloging in OCLC WorldCat.