Author: Read, C.B., & Mamay, S.H., 1964.:
Title: Upper Paleozoic floral zones and floral provinces of the United States. With a glossary of stratigraphic terms by Grace B. Keroher. [U.S. Geol. Surv. Prof. Pap., 454-K.]
Description: Washington. 4to. Pp. iv,35,[3], 68 large photos on 19 pls., refs., index. Orig. wrs.

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