LC classification outline /
Library of Congress.Subject Cataloging Division.
Library of Congress.Classification Division.Classification. Outline scheme of classes.
Washington : Library of Congress,
1978.
Editions of 1903-1934 published by Classification Division, Library of Congress, under title: Classification. Outline scheme of classes; rev. and enl. ed. (1942) and 2d ed. (1970) published by Subject Cataloging Division under title: Outline of the Library of Congress classification.
Classification, Library of Congress.