Library of Congress subject headings.
- 34th ed.
- Washington : Library of Congress, 1975-
- 6 v. (various pagings) ; 30 cm.
Previous editions have title: Subject headings used in the dictionary catalogs of the Library of Congress. Incorporates material through 1973. Kept up to date by cumulative supplements issued quarterly with annual, biennial, and triennial cumulations, 1974- 1976; issued quarterly with annual cumulations, 1977-