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Kept up to date by the office's L.C. classification--additions and changes, and by two publications issued by Gale Research Company entitled: Library of Congress classification schedules--a cumulation of additions and changes, and Library of Congress classification schedules combined with additions and changes. ; Mode of access: Internet.

Includes index. ; Kept up to date by the office's L.C. classification--additions and changes, and by two publications issued by the Gale Research Company entitled: Library of Congress classification schedules--a cumulation of additions and changes, and Library of Congress classification schedules combined with additions and changes. ; Rev. ed. of: Classification. Class U: Military science / Library of Congress, Subject Cataloging Division. 4th ed. 1974. ; Mode of access: Internet.

Includes indexes. ; First ed. published in 1910 by the Classification Division. ; "Additions and changes to April 1900": 137 p. at end. ; Mode of access: Internet.

Includes index. ; Rev. ed. of: Classification. Class J. Political science / Office for Subject Cataloging Policy, Collections Services, Library of Congress. 2nd ed., 1991 revision. 1991. ; Mode of access: Internet.