1930 The Ute Indians. Leaflet No. 10, Denver Art Museum. Denver.
DUNBAR, J. B.
1880 The Pawnee Indians, Their History and Ethnography. Magazine of American History, Vol. 4, No. 4, pp. 241-281.
FENENGA, F.
1953 The Weights of Chipped Stone Points: A Clue to Their Functions. Southwestern Journal of Anthropology, Vol. 9, No. 3, pp. 309-323. Albuquerque.
FENNEMAN, N. M.
1931 Physiography of Western United States. McGraw-Hill. New York.
FLINT, R. F.
1957 Glacial Geology of the Pleistocene Epoch. Wiley and Sons. New York.
FORBES, LITTON