Author: Hager, M.W., 1974.:
Title: Late Pliocene and Pleistocene history of the Donnelly Ranch vertebrate site, Southeastern Colorado.
Description: [Univ. Wyoming Contr. Geol.. Spec. Pap., 2.] Laramie, Wy. 4to. Pp. 62, 33 pls., figs. and diagrs. (2 fold.), refs. Orig. wrs.

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