Region
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Ohio Shale
1
Ohio Valley
6
Ohio valley
1
Pennsylvania
6
Pickawillany, O.
1
Pickawillany, Ohio
1
Pittsburgh
2
Southern States
4
Southwest, Old
3
Sunwatch Site (Dayton, Ohio)
2
Tennessee
1
Tennessee River Valley
3
United States
41
Virginia
2
Wabash River Valley
1
West (U.S.)
2
West Indies
1
West Virginia
10