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______. The Fighting Cheyennes, University of Oklahoma Press, 1956.

HASSRICK ROYAL B. The Sioux, University of Oklahoma Press, 1963.

HYDE, GEORGE E. Indians of the High Plains, University of Oklahoma Press, 1959.

______. The Pawnee Indians, University of Denver Press, 1951.

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______. Indians of the Plains, American Museum of Natural History, New York, 1954.

MANDELBAUM, DAVID G. The Plains Cree, American Museum of Natural History, New York, 1940.

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______. "Some Notes on Pipe Making Stone and Place Names in and Around the Plains." Minnesota Archeologist, October 1963.

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The Monument visitor center. (National Park Service colorphoto.)