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Locations of sites in midwestern North America yielding Powell plain or Ramey incised pottery.
Kelly, John 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. Table 4.5, p.69
Image courtesy of the Board of Trustees of the University of Illinois.