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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.
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.
The whole application process for a LCCN for self-publishers is automated and completed online before your book is published. The process generally takes one to two weeks. The Library of Congress uses a system called a Preassigned Control Number (PCN) to assign your book an LCCN before publication.
Here’s where to start: Go to Google … or www.LOC.gov. Enter: “ Library of Congress book number ” and click on “ Search. “Preassigned Control Number Program” will appear. Or go to www.LOC.gov. Click on “ Open an Account ” if appropriate. You will get an email acknowledging this first step–don’t stop.
Here are your steps: The LCCN: the Library of Congress Control Number. It is free and can be obtained quickly—usually within a day or two via email back to you. You must have your ISBN to get it. And you must do it before you publicly sell your book/publish.
How to Get Your LCCN Number. Next up is the LCCN number (Library of Congress Control Number aka Library of Congress Card Number). This is a number assigned to the Library Of Congress bibliographic record of your book.
The LCCN creates a catalogue record of your book in the LOC. The LOC is the nation's library AND the largest library in the world. An LCCN should not be mistaken for a copyright. LCCNs and copyrights are both at loc.gov, but that is where their similarity ends.
