"This cumulation includes the revisions to January, 1965 ... and the revisions published in LC Classification-additions and changes, list 137 (Jan.-Mar.,1965) through list 248 (Oct.-Dec.,1992)" -t.p. verso.
Revisions to: Classification: class P, subclass PQ, part 2, Italian, Spanish and Portuguese literatures. Washington: Library of Congress, 1937.
Library of Congress classification schedules : a cumulation of additions and changes through 1992. Class P, subclass PQ, part 2, Italian, Spanish, and Portuguese literatures. ISBN 0810382504. Published by Gale Research in 1993. Publication and catalogue information, links to buy online and reader comments.