一般注記First ed. published in 1935 by the Classification Division.
"Additions and changes to July 1964": 191 p. at end.
Kept up to date by the Division's L.C. classification--additions and changes, and by 2 publications irregularly issued by Gale Research Company entitled: Library of Congress classification schedules--a cumulation of additions and changes, Class P, subclasses PJ-PM; and Library of Congress classification schedules combined with additions and changes.