Library of Congress. Union Catalog Division

• United States author headings
• A tentative list of catalogs of microforms
• Cooperative work of Card Division, Union Catalogs, Cooperative Cataloging and Classification Service, and A.L.A. Cooperative Cataloging Committee
• Great Britain author headings
• Key to symbols used in the Union catalog
• Newspapers on microfilm
• Quintus Horatius Flaccus
• Symbols of American libraries
• Symbols used in the National Union Catalog of the Library of Congress