Author: Gardner, J., & Bowles, E., 1939.:
Title: The Venericardia planicosta group in the Gulf Province.
Description: [U.S. Geol. Surv. Prof. Pap., 189-F.] Washington. 4to. Pp. [ii],143-215, many photos on 14 pls., 3 fold. maps, 3 fold. tabs., refs., index. Orig. wrs. - Eocene.

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