Library of Congress

Library of Congress, U.S. national library located east of the Capitol in Washington, D.C. Originally established by Congress in 1800, it now contains more than 80 million items—including books, pamphlets, maps, photographs, and the like—making it one of the world's largest research libraries. The library's catalog, the National Union Catalog, lists books in libraries all over the United States and Canada.

See also: Library.