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3. Holder, Preston (1970). The Hoe and the Horse on the Plains. Lincoln: University of Nebraska Press.
4. Johnson, Craig M. (1998). “The Coalescent Tradition.” In: Archaeology on the Great Plains, ed. W. R., Wood. Lawrence: University Press of Kansas, 308–344.
5. Lehmer, Donald J. (1971). Introduction to Middle Missouri Archaeology. Washington, D.C.: National Park Service.