Region
Nevada
9
Nye County
5
Texas
5
Sonoran Desert
4
Arizona
2
Bonneville, Lake, Region
2
California
2
California, Southern
2
Cattaraugus County
2
Death Valley (Calif. and Nev.)
2
Illinois
2
New Mexico
2
New York (State)
2
Rio Grande Region (Colo.-Mexico and Tex.)
2
Southwestern States
2
United States
2
Utah
2
Yucca Mountain
2
Bureau County
1
Grand County
1
Great Basin
1
Indiana
1
Kentucky
1
Ohio
1
Palo Duro Basin
1
Pecos River Region (N.M. and Tex.)
1
San Juan County
1
Swisher County
1
Tennessee
1
Trans-Pecos Region (Tex. and N.M.)
1
West (U.S.)
1