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A Library of Congress control number (LCCN) is a unique identification number that the Library of Congress assigns to the catalog record created for each book in its cataloged collections. Librarians use it to locate a specific Library of Congress catalog record in the national databases.
Identifiers Assigned by the Library of Congress: LCCNs (Library of Congress Control Numbers) and LCCN Permalinks, LC call numbers (classified and shelf location numbers), LC Handles (for digital content)
To help you locate ebooks and ejournals described in LC Catalog records, the Library of Congress uses OpenURLs – URLs that dynamically construct web searches for full text available either onsite at the Library or through fee-based and freely-accessible websites.
Searches for Library of Congress Control Numbers (LCCN), International Standard Book Numbers (ISBN), and International Standard Serial Numbers (ISSN). Numbers must be entered in exact order beginning with the first character.
Library of Congress Control Number: 2019012345. New Account. To obtain Library of Congress control numbers for your forthcoming books, you must first complete the Application to Participate and obtain an account number and password.
A Preassigned Control Number (PCN) is a Library of Congress Control Number (LCCN) which has been "preassigned" to a given work prior to the work's publication via the CIP or PCN Programs. A publisher of an eligible work may obtain a pre-assigned LCCN if the work has not yet been published .
Call numbers can usually be located on the lower part of the spine of the book. Search for the book in our Library Search. The results screen will tell you the location, call number, and whether or not the book is available on shelf.
