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Frequencies of vessel shapes and temper for Cahokia tracts 15A and 15B ceramics.
Vogel, J.O. 1975. Trends in Cahokia ceramics: Preliminary study of the collections from tracts 15A and 15B. In Perspectives in Cahokia Archaeology, edited by J.A. Brown, pp. 32-125. IAS Bulletin No. 10. Table 3, p.41
Image courtesy of Illinois Archaeological Survey.