Region
United States
51
Canada
12
Germany
8
California
3
Hanscom AFB (Mass.)
2
North Pacific Ocean
2
Ontario, Lake (N.Y. and Ont.)
2
Tajikistan
2
Texas
2
Ukraine
2
United States, West
2
West (U.S.)
2
Alaska
1
Allemagne
1
Colma Creek
1
Eniwetok Atoll
1
Hamilton Harbour
1
Marshall Islands
1
Mercury
1
Mercury (Planet)
1
Montana
1
Ontario
1
San Joaquin Valley
1
South Dakota
1
Yucca Mountain (Nev.)
1