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Featherstonaugh's drawing of Monk's mound looking to the north showing conical mound on the southeast corner of the third terrace.
Fowler, M. L. 1997. The Cahokia Atlas: A Historical Atlas of Cahokia Archaeology. revised edition. University of Illinois, Urbana. Fig. 5.1, p.88
Image courtesy of the Board of Trustees of the University of Illinois and the Illinois Transportation Archaeological Research Program.