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Classification.
Class Q, Science.

APA Citation

Library of Congress. Subject Cataloging Division. (1957). Classification. 5th ed. (with supplementary pages) Washington: U.S. Govt. Print. Off..

MLA Citation

Library of Congress. Subject Cataloging Division. Classification. 5th ed. (with supplementary pages) Washington: U.S. Govt. Print. Off., 1957.

Warning: These citations may not always be complete (especially for serials).