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Chert knife and hoes from the Cahokia site (1. Chert knife from Ramey Mound, 2.,4. Spades from fields sw of Monks Mound, 3. Notched hoe, 5. Spade from west side of Ramey Mound).
Moorehead, W.K. 1929. The Cahokia Mounds. University of Illinois, Urbana. plate XXVI