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Evidence of Cahokia's interaction with other Native American cultures in the Midwest - sites with Ramey Incised and/or Powell Plain vessels.
Kelly, J. E. 1991. Cahokia and its Role as a Gateway Center in Interregional Exchange. In Cahokia and the Hinterlands, edited by T. E. Emerson and R. B. Lewis, pp 61-80. University of Illinois Press, Urbana Fig. 4.3, p.71
Image courtesy of the Board of Trustees of the University of Illinois and the Illinois Transportation Archaeological Research Program.