5KENT K. PECK, "The Cultivation and Weaving of Cotton in the Prehistoric Southwestern United States", Transactions of the American Philosophical Society, New Series, vol. 47, Part 3, 1957,p. 473.
6Henry C. Koerper,"A Game String and Rabbit Stick Cache from Borrego Valley, nia and Great Basin Anthropology, vol. 20, Issue. 2, 1998, pp. 252 -253.
7Henry C. Koerper,"A Game String and Rabbit Stick Cache from Borrego Valley, nia and Great Basin Anthropology, vol. 20, Issue. 2, 1998, pp. 254-265.
8San Diego County" ,Journal of Call for- San Diego County", Journal of Call.for- Payson D. Sheets,"Artifacts", Robert J. Sharer(ed. ), The Prehistory of Chalchuapa, El Salvador,volume Two, Part I , Philadelphia： University of Pennsylvania Press, 1978, pp. 2 107.
9William R. Coe, Piedras Negras Archaeology ： Artifacts, Caches, and Burials, Philadelphia： University of Pennsylvania, 1959, p. 20.
10Stewart Culin, (;ames of North American Indians, New Yorkz LMver Publications, 1975, pp. 255-257.
