Author: Knowlton, F.H., 1909.:
Title: The stratigraphic relations and paleontology of the "Hell Creek Beds", "Ceratops Beds" and equivalents and their reference to the Fort Union Formation.
Description: Proc. Washington Acad. Sci., 11(1-3): pp. 179-293, notes & refs. Plain new wrappers. - Includes also: The age and stratigraphic relations of the "Ceratops Beds" of Wyoming and Montana, by T.W. Stanton (pp.239-293)..

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