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  1. 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.

    • ISBN

      Library of Congress Control Numbers are record identifiers...

    • Publishing

      Services for Publishers. Find information on registering a...

  2. 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. The account number and password will provide you access to the appropriate form for requesting Library of Congress control numbers.

  3. The Library of Congress Control Number (LCCN) is a serially based system of numbering cataloged records in the Library of Congress, in the United States. It is not related to the contents of any book, and should not be confused with Library of Congress Classification (LCC).

  4. One of the Library's most common controlled vocabularies is the Library of Congress Subject Headings (LCSH). In addition to providing cross-references, scope notes identify LC classification numbers associated subject headings and clarify how particular headings have been used in the LC Catalog.

  5. 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.