![Information for Researchers - Using the Library of Congress](https://webarchive.library.unt.edu/web/20090112050840im_/http://www.loc.gov/rr/main/images/inforeas-title.gif)
Union Catalogs
Union catalogs are used to determine which libraries hold particular
items.
The National Union Catalog (NUC) is a record of publications held
in more than eleven hundred libraries in the United States and Canada,
including the Library of Congress. Major portions of the NUC are
published in two principal series: one covering post-1955 publications
and the other pre-1956 imprints. Since 1983, the NUC has been issued
on microfiche. The NUC, an author catalog, contains some entries
for works in the Library's collections that are not listed in its
own general catalogs; consequently, it should be consulted in any
thorough examination of the Library's resources.
The printed NUC is housed adjacent to the Main Reading Room in
the Jefferson Building and around the perimeter of the center room
near the Science Reading
Room in the Adams Building, fifth floor. The microfiche NUC
is available in the Microform
Reading Room and at the Business
Reference Services desk.
The Chinese, Japanese, and Korean Union Catalogs, and the South
Asian and Southeast Asian Union Catalogs are held by the Asian
Division. The Near East, Hebrew, and Yiddish Union Catalogs
are held by the African and
Middle Eastern Division. The Slavic and Cyrillic Union Catalogs
are held by the European
Division.
Access to the OCLC and RLIN union catalog databases is provided
in the Library's reading rooms.
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