Author: Knowlton, F.H., 1922.:
Title: The Laramie flora of the Denver Basin. With a review of the Laramie problem. [U.S. Geol. Surv. Prof. Pap., 130.]
Description: Washington. 4to. Pp. iv,175, many photos and figs. of leaf remains on 28 pls., refs., index. Orig. wrs. Faint trace of waterstain on front cover, good otherwise. - Upper Cretaceous, Eastern Colorado.

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