Region
United States
42
California
10
Alaska
6
Oregon
5
Montana
4
Arizona
3
Colorado
3
Snake River Region (Wyo.-Wash.)
3
Utah
3
Idaho
2
Malheur National Wildlife Refuge
2
Malheur National Wildlife Refuge (Or.)
2
New Mexico
2
New River Gorge National Park and Preserve
2
New River Gorge National Park and Preserve (W. Va.)
2
Noatak National Preserve (Alaska)
2
Rocky Mountain National Park (Colo.)
2
San Bernardino County
2
San Joaquin Valley
2
Snake River Plain (Idaho and Or.)
2
West (U.S.)
2
West Virginia
2
Wyoming
2
Afton Canyon Natural Area
1
Afton Canyon Natural Area (Calif.)
1
Bonneville Salt Flats
1
California, Southern
1
Canada
1
Centennial Mountains (Idaho and Mont.)
1
Colorado Plateau
1
Costa Rica
1
Cumberland Gap National Historical Park
1
El Malpais National Conservation Area
1
El Malpais National Conservation Area (N.M.)
1
Fort Davis National Historic Site
1
Fort Davis National Historic Site (Tex.)
1
Grand Canyon National Park
1
Grand Canyon National Park (Ariz.)
1
Grant-Kohrs Ranch National Historic Site
1
Grant-Kohrs Ranch National Historic Site (Mont.)
1
Great Britain
1
Kansas
1
Kenai National Wildlife Refuge (Alaska)
1
Kentucky
1
Kings Canyon National Park (Calif.)
1
Kobuk Valley National Park
1
Kobuk Valley National Park (Alaska)
1
Linn County
1
Mexico
1
Mineral King Valley
1
more ...