Douglas, F.H.: Indian Art of the United States, New York, 1941; Conn, R.: Native American Art in the Denver Art Museum, New York, 1979; Maurer, E.M.: The Native American Heritage, Chicago, 1977; Dockstader, F.J.: Indian Art in America, The Arts and Crafts of the North American Indian, Weert, 1966; Appleton, L.R.H.: Indian Art of the Americas, New York, n.d.; and twenty-two others of similar interest (29)