Region
Wyoming
23
Carbon County
4
Powder River Basin (Wyo. and Mont.)
2
Sweetwater County
2
Buffalo Hump Site (Wyo.)
1
Campbell County
1
Colorado
1
Converse County
1
Idaho
1
Lincoln County
1
Lincoln County (Wyo.)
1
Medicine Bow National Forest (Wyo.)
1
Montana
1
Natrona County
1
Nevada
1
North Dakota
1
Utah
1