Region
Wyoming
Powder River Basin (Wyo. and Mont.)
2
Black Thunder Creek Region
1
Campbell County
1
Dry Fork
1
Gillette Region
1
North Fork Dry Fork Cheyenne River Region
1
Powder River (Wyo. and Mont.)
1
Wheatland
1
White Tail Butte
1
White Tail Butte (Wyo.)
1
White Tail Butte Region
1
White Tail Butte Region (Wyo.)
1