CATLIN, G.: North American Indians, 2 Volumes, Edinburgh, 1926; Dixon, J.K.: The Vanishing Race, New York, 1914; Dellenbaugh, F.S.: The North Americans of Yesterday, New York, 1901; McKenney, T.L. and Hall, J.: The Indian Tribes of North America, 3 Volumes, Edinburgh, 1972 reprint of the 1933/4 edition; and 3 other volumes of similar interest (10)