Region
United States
71
Colorado
38
California
14
Utah
9
Arizona
7
China
6
Washington (State)
6
Nevada
5
New Hampshire
5
Outer space
5
Alaska
4
Germany
4
Homestake Mine (S.D.)
4
Italy
4
San Francisco Bay Area
4
Solar system
4
Idaho
3
Nebraska
3
New York (State)
3
Trinity Aquifer (Tex.)
3
Yucca Mountain
3
Barre Region
2
Berthoud Pass
2
Canada
2
Castle Creek, South Fork
2
Dundy County
2
Earth
2
Fairbanks
2
Great Britain
2
Greece
2
Idaho Springs
2
Illinois
2
Kentucky
2
Lucky Friday Mine
2
Mississippi River Valley
2
Montana
2
Netherlands
2
Oakland Region
2
Ohio
2
Pennsylvania
2
Pima County
2
Puerco River (N.M. and Ariz.)
2
Saint Helens, Mount (Wash.)
2
South Dakota
2
Texas, South
2
Vermont
2
Wasatch Range (Utah and Idaho)
2
Washington Metropolitan Area
2
West (U.S.)
2
Yuma County
2
more ...