Mexico, D. F., Universidad Nacional Autonoma de Mexico, 1954-1984. 48 issues in 48. 8vo (23.0 x 17.0 cm). Over 3,000 pp.; numerous plates. Original uniform stiff, printed wrappers.

A long run of this important series which is less known than many American palaeontological series, with many papers on Tertiary Mollusca, but also several papers on Mesozoic cephalopods. Contributions to Mollusca are the most common. With a few exceptions, each issue contains a single monograph The following issues are present: 1-27, 29-46, 48-50 (i.e. lacking issues 28 and 47 only). Stamp on front most wrappers, otherwise very good copies.