American Catalogue Association

The American Catalogue Association, now known as the Library of Congress Control Number (LCCN) Program, was responsible for assigning unique identification numbers to books and other library materials in the United States. These numbers helped libraries catalog and organize their collections efficiently, making it easier to locate and reference items. The system ensured consistency in bibliographic records across institutions, facilitating resource sharing and accurate identification of materials. Today, similar functions are managed through standard library classifications and identifiers, with the LCCN remaining a key tool in library cataloging practices.