Outline of the Library of Congress classification.
Rev. and enl. ed. of "Outline scheme of classes".

APA Citation

Library of Congress. Subject Cataloging Division., Library of Congress. Classification Division. Classification. Outline scheme of classes. (19421966). Outline of the Library of Congress classification: Rev. and enl. ed. of "Outline scheme of classes". Washington.

MLA Citation

Library of Congress. Subject Cataloging Division, and Library of Congress. Classification Division. Classification. Outline scheme of classes. Outline of the Library of Congress Classification: Rev. And Enl. Ed. of "Outline Scheme of Classes". Washington, 19421966.