Author: Boyd, D.W., & Newell, N.D., 1968.:
Title: Hinge grades in the evolution of crassatellacean bivalves as revealed by Permian genera.
Description: [Amer. Mus. Novit., 2328.] New York. Pp. 52, 24 figs. and photos, refs. Wrs. Two staple rust marks in fold, good otherwise.

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