Region
United States
36
Colorado
34
China
5
Boulder County
3
California
3
Captain Jack Mill Hazardous Waste Site (Colo.)
3
Alaska
2
Colorado Canyons National Conservation Area (Colo. and Utah)
2
Europe
2
Great Britain
2
Hawaii
2
Iraq
2
Israel
2
Oregon
2
Texas
2
West (U.S.)
2
Ada County
1
Arab countries
1
Asia
1
Asia, Eastern
1
Colombia
1
Cuba
1
Delaware
1
Denver
1
Des Lacs National Wildlife Refuge (N.D.)
1
East Asia
1
European Union countries
1
Fort Collins
1
Galveston Island
1
Gaza Strip
1
Grand Teton National Park
1
Hokkaido (Japan)
1
Idaho
1
Islamic countries
1
Italy
1
J. Clark Salyer National Wildlife Refuge (N.D.)
1
Japan
1
Kilauea National Wildlife Refuge
1
Kilauea National Wildlife Refuge (Hawaii)
1
Kodiak Region
1
Los Angeles
1
Los Angeles County
1
Louisiana
1
Maine
1
McKenzie River Watershed
1
Mississippi River
1
Moosehorn National Wildlife Refuge (Me.)
1
New York (State)
1
North Dakota
1
Prime Hook National Wildlife Refuge (Del.)
1
more ...