The copyright registration number is typically formatted as two or three letters (depending on the classification) followed by one to seven digits.
Copyright Office at the Library of Congress. Library of Congress call numbers are assigned by Library catalogers based on the the Library of Congress Classification (LCC) system.Ī unique number assigned to all works registered with the U.S. For more information, see the online catalog's Help pages.Ī Library of Congress call number is a unique number assigned to items in the Library's collections that represents the item in the Library's online catalog, identifies the specific copy of the item in the collections, and gives its relative location on the shelf. In the Library's online catalog, LCCNs are reformatted to remove hyphens and standardize character length. In addition, LCCNs for some items cataloged before 2001 may include an alphabetic prefix: What is now known as the Library of Congress Control Number was originally known as the Library of Congress Card Number until the advent of machine-readable records for book materials in the late 1960s.Īn LCCN can have one of two different structures, based on when it was assigned: Please note that not all books that receive an LCCN are cataloged by the Library or added to its collections. Under certain circumstances, however, a card number can be assigned before the book is published through the Preassigned Control Number Program. The Library of Congress assigns this number while the book is being cataloged. Librarians use it to locate a specific Library of Congress catalog record in union catalogs such as WorldCat External and, in the past, used it to order catalog cards from the Library of Congress or commercial suppliers. Library of Congress Control Number (LCCN)Ī Library of Congress Control Number (LCCN) External is a unique identification number that the Library of Congress assigns to the catalog record created for each book in its cataloged collections. There are several Library of Congress numbers which users often conflate. What do the different Library of Congress numbers mean?
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