Author: Cobban, Wm.A., 1987.:
Title: Some Middle Cenomanian (Upper Cretacous) Acanthoceratid ammonited from the Western Interior of the United States. [U.S. Geol. Surv. Prof. Pap., 1443.]
Description: Washington 1987. 4to. Pp. iv,28,[2], 306 photos on 13 plates, 18 figs., refs., index. Orig. printed wrappers.

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