LYFORD, C.A.: Quill and Beadwork of the Western Sioux, Kansas, 1940; Ferg, A.(Ed.): Western Apache Material Culture, Arizona, 1987; Torrence, G. and Hobbs, R.: Art of the Red Earth People, Iowa, 1989; Ewers, J.C.: Plains Indian Sculpture, Washington D.C., 1986; Furst, P.T. and Furst, J.L.: North American Indian Art, New York, 1982; and 40 other volumes of similar interest (45)