Library of Congress Control Number (LCCN)
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A Library of Congress Control Number (LCCN) is a unique, numerical identifier that contains a year and serial number. The LCCN is assigned by the Library of Congress to book titles before they are published. The Library of Congress decides whether a book is added to its collection after publication, when you mail a copy of your book to the Library for review.
Note: You only need one LCCN per book title. Your LCCN(s) will be delivered to your email within 1 to 2 business days. Be sure to whitelist email@example.com to prevent the email from going to your spam folder.