Symbols of American libraries
Edition: 1st]- ed.; 1932-
Publisher: Library of Congress.
Place of publication: Washington
Language: eng
Subjects: Libraries; Abbreviations
Notes: Title varies : 1932-36, Key to symbols used in the Union Catalog (varies slightly) -- 1942-66, Symbols used in the National Union Catalog of the Library of Congress (varies slightly).

Vols. for 1932- Issued by the Union Catalog Division, Library of Congress.