Author: Imlay, R.W., 1953.:
Title: Callovian (Jurassic) ammonites from the United States and Alaska. I-II.
Description: [U.S. Geol. Surv. Prof. Pap., 249-A/B.] Washington. 4to. Vol. 1: pp. iv,1-40; vol. 2: pp. iv,41-108; numerous photos on 55 pls., 9 (4 fold.) tabs., 9 figs. and index maps, refs., indexes. In two parts as issued, orig. wrs. - I: Western Interior, United States. II: Alaska Peninsula and Cook Inlet regions.

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