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Pin on Wish List . Library of congress control numbers ( lccns) are record identifiers assigned by the library of congress to bibliographic and authority records. Library of congress catalog card number: The Library of Congress released a fascinating history of card catalogs. Wait, come back! Vox from www.vox.com The main card catalog, located adjacent to the main reading room on the first floor of the jefferson building, contains subject, author, title, and some other cards for. Library of congress control numbers ( lccns) are record identifiers assigned by the library of congress to bibliographic and authority records. A library of congress catalog card number is a unique identification number that the library of congress assigns to the catalog record created for each book in its cataloged collections.