Author: Knowlton, F.H., 1930.:
Title: The flora of the Denver and associated formations of Colorado. A posthumous work edited by E.W. Berry. [U.S. Geol. Surv. Prof. Pap., 155.]
Description: Washington. 4to. Pp. iv,142, many photos and drawings on 59 plates, index. Orig. wrappers. - Late Cretaceous.

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