Region
United States
8
Colorado
2
Great Britain
2
Mexican-American Border Region
2
Clarke County
1
Columbia River Watershed
1
Death Valley Region (Calif. and Nev.)
1
El Paso County
1
Great Plains
1
Hawaii
1
Indiana
1
Louisiana
1
Mississippi River Valley
1
New Hampshire
1
New Mexico
1
Oklahoma
1
Pueblo County
1
South Platte River Watershed (Colo. and Neb.)
1
Texas
1
Utah
1
Virginia
1