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• Library of Congress subject headings /
  gan: Library of Congress. Cataloging Policy and Support Office
  Cyhoeddwyd: (2007)
• Library of Congress subject headings /
  gan: Library of Congress. Cataloging Policy and Support Offices. Collections Services
  Cyhoeddwyd: (1998)
• Library of Congress subject headings /
  gan: Library of Congress. Cataloging Policy and Support Offices. Collections Services
  Cyhoeddwyd: (1999)
• Library of Congress subject headings /
  gan: 2049 Library of Congress
  Cyhoeddwyd: (1993)
• Library of Congress subject headings /
  gan: Library of Congress. Subject Cataloging Division
  Cyhoeddwyd: (1988)