Classification. Class P. Subclasses P-PM. Supplement. Index to languages and dialects / Subject Cataloging Division, Processing Services, Library of Congress

Kept up to date by the division's L.C. classification--additions and changes, and by two publications irregularly issued by Gale Research Company entitled: Library of Congress classification schedules--a cumulation of additions and changes, Class P, Subclasses P-PM, Supplement and Library of Congress classification schedules combined with additions and changes