The Library of Congress Control Number is a serial number code used by the Library of Congress database in the United States. This number is widely used by libraries in cataloging their books. While this number does not really have anything to do with book selling, having a Library of Congress number just makes it easier for your book to be cataloged by libraries. It is also free, so there’s no harm in applying for it!
At Powerful Films and Books, we automatically apply for a Library of Congress number for your book as part of our publishing process and submit a free copy of your book for archival.