American Library Association. Committee on Resources of American Libraries. National Union Catalog Subcommittee., ., Library of Congress., . (19681981). The National union catalog, pre-1956 imprints: a cumulative author list representing Library of Congress printed cards and titles reported by other American libraries. London: Mansell.MLA Citation
American Library Association. Committee on Resources of American Libraries. National Union Catalog Subcommittee, and Library of Congress. The National Union Catalog, Pre-1956 Imprints: a Cumulative Author List Representing Library of Congress Printed Cards And Titles Reported by Other American Libraries. London: Mansell, 19681981.
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