Author: Ward, L.F., 1899.:
Title: The Cretaceous formations of the Black Hills as indicated by the fossil plants, With the collaboration of W.J. Jenny, Wm.M. Fontaine, and F.H. Knowlton.
Description: Ann. Rep. U.S. Geol. Surv., 19(2): pp. 521-946, numerous illus. on 120 pls., 6 figs. 4to. New cloth. - Most of the plates show remains of Cycad species.

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