HELPFUL LINKS To convert 10-digit ISBNs to 13-digit ISBNs: To access the ISBN User Manual: To access FAQs about assigning ISBNs: To learn more about the international administration of the ISBN system: For Copyright, Library of Congress Control Number (LCCN), and the Cataloging in Publication Program (CIP), please contact the Library of Congress. For information regarding bar coding and other publishing industry standards: