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Subject (Region)
- North America15
- United States13
- Canada12
- Illinois10
- Amérique du Nord6
- Maine3
- America2
- Great Britain2
- Great Plains2
- Illinois River Valley (Ill.)2
- La Salle County (Ill.)2
- Massachusetts2
- Nebraska2
- Northwest Coast of North America2
- Apple Creek site (Ill.)1
- Bingham County (Idaho)1
- British Columbia1
- Colombie-Britannique1
- Colorado1
- Copan Lake Region (Okla. and Kan.)1