Catalog of Title Entries...
1891-1906 - LC 3.5: GPL Microfilm 17 only
Catalog of Copyright Entries
1906-1946
LC 3.6:, LC 3.6/1: through LC 3.6/4:
GPL Microfilm 17; Storage; unbound, incomplete; see shelflist
See Andriot for parts
1947-1977
Catalog of Copyright Entries. Third Series.
LC 3.6/5: Storage; unbound; cataloged by part in MNCAT
See Andriot for parts
1978-1982
http://www.copyright.gov
LC 3.6/6:
1978 in paper, GPL
1979-1981 or 1982 (depending on series), microfiche, GPL