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Incisors which have been filed, presumably for decorative purposes.
Perino, G. H. 1971. The Mississippian Components at the Schild site (No. 4) Greene County, Illinois. In Mississippian Site Archaeology in Illinois: I. Site Reports from the St. Louis and Chicago Areas, edited by J.A. Brown, pp. 1-148. IAS Bulletin No. 8. Fig. 24.
Image courtesy of Illinois Archaeological Survey.