Author: Imlay, R.W., 1960.:
Title: Ammonites of Early Cretaceous age (Valanginian and Hauterivian) from the Pacific Coast States.
Description: [U.S. Geol. Surv. Prof. Pap., 334-F.] Washington. 4to. Pp. iv,167-228, many photos and drawings on 20 pls., 1 fold. chart in pocket, 3 index maps, refs., index. Orig. wrs.

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