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If you plan to sell your book in libraries, you'll need an LCCN (Library of Congress Catalog Number). You can order your own through the web site of the Cataloging in Publication Division of the Library of Congress. The best news is that applying for an LCCN is free, so it makes sense to simply add an LCCN when you self publish a book.
*Remember, your book must be longer than 50 pages to qualify for an LCCN, so many children's books and others do not apply