Region
United States
35
West (U.S.)
17
Rocky Mountains
15
Arizona
14
Colorado
10
Montana
7
Idaho
6
Black Hills (S.D. and Wyo.)
4
Great Basin
4
New Mexico
4
Southern States
4
Northeastern States
3
Santa Rita Experimental Range
3
Santa Rita Experimental Range (Ariz.)
3
Southwest, New
3
Black Hills National Forest (S.D. and Wyo.)
2
Missouri Breaks
2
Northwest, Pacific
2
Northwestern States
2
Oregon
2
South Dakota
2
Utah
2
Washington (State)
2
Wyoming
2
Arapaho National Forest
1
Bitterroot River Valley
1
Bob Marshall Wilderness
1
Boundary Waters Canoe Area (Minn.)
1
British Columbia
1
California
1
Carson National Forest
1
Carson National Forest (N.M.)
1
Coram Experimental Forest
1
Coram Experimental Forest (Mont.)
1
Custer State Park
1
East (U.S.)
1
Fort Valley Experimental Forest (Ariz.)
1
Four Corners Region
1
Fraser River Valley
1
Front Range (Colo. and Wyo.)
1
Great Plains
1
Hawaii
1
High Plains (U.S.)
1
Lincoln National Forest
1
Lolo National Forest
1
Madrean Archipelago
1
Mexican-American Border Region
1
Mexico
1
Middle West
1
Nevada
1
more ...