"This cumulation consists of the revisions published in LC Classification-additions and changes, list 231 (July-Sept.,1988) through list 248 (Oct.-Dec.,1992)" - t.p. verso.
Revisions to: Classification: class P, subclasses PL-PM, languages of Eastern Asia, Africa, Oceania, hyperborean, Indian, and artificial language. Washington: Library of Congress, 1988.
Library of Congress classification schedules : a cumulation of additions and changes through 1992. Class P, subclasses PL-PM, languages of Eastern Asia, Africa, Oceania, hyperborean, Indian and artifi. ISBN 0810382504. Published by Gale Research in 1993. Publication and catalogue information, links to buy online and reader comments.