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Evidence of trade and cultural interactions - a Ramey Incised vessel from a site in western Iowa.
Tiffany, J. 1991. Modeling Mill Creek-Mississippian Interaction. In New Perspectives on Cahokia, edited by J. B. Stoltman,pp.319-354. Monographs in World Archaeology No. 2. Prehistory Press, Madison. Fig. 15.4b, p.325 Image courtesy of Prehistory Press.