Library of Congress Classification. Class Q. Science (Washington : The Library of Congress, 1989)
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 Q an d Library of Congress classification schedules combined with additions and changes.
Keywords: Classification, Library of Congress -- Periodicals; Classification -- Books -- Science