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data table with the 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 "
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