Region
United States
8
Pennsylvania
7
Colorado
2
Conservation of natural resources
2
Delta County
2
Environmental policy
2
Fremont County
2
Lander
2
Paonia
2
West (U.S.)
2
Wyoming
2
Brandywine Creek Valley (Pa. and Del.)
1
Caledonia State Park (Pa.)
1
Penn
1
Sierra Nevada
1
Sierra Nevada (Calif. and Nev.)
1
U.S.A.
1
United States, West
1
West United States
1