Author: Simpson, G.G., 1937.:
Title: The Fort Union of the Craxy Mountain Field, Montana antd its mammalian faunas. [U.S. Natl. Mus. Bull., 169.]
Description: Washington. 8vo. Pp. x,287, 10 pls., 80 figs., bibl., index. Orig. wrs., uncut. - Upper Cretaceous and Paleocene.

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