Region
United States
1,492
Washington (D.C.)
28
China
9
Iraq
9
Afghanistan
6
California
4
Africa South of the Sahara
3
Africa, Sub-Saharan
3
Alaska
3
Bosnia and Herzegovina
3
Nevada
3
New Mexico
3
Puerto Rico
3
Utah
3
Andes Region
2
Arizona
2
Caribbean Area
2
Chesapeake Bay Watershed
2
Cuba
2
Developing countries
2
Europe
2
Hawaii
2
Kosovo (Republic)
2
Latin America
2
Massachusetts
2
New York (State)
2
North Slope
2
Pacific Ocean
2
Pennsylvania
2
Texas
2
Washington (State)
2
West (U.S.)
2
Apache County
1
Arkansas
1
Australia
1
Bahrain
1
Bandelier National Monument
1
Bandelier National Monument (N.M.)
1
Bay Mills Indian Community, Michigan
1
Bulgaria
1
Butte County
1
Butte County (Calif.)
1
Carl Sandburg Home National Historic Site (Flat Rock, Henderson County, N.C.)
1
Central America
1
Chile
1
Colombia
1
Connecticut
1
Dayton
1
Dominican Republic
1
Eightmile River Wild and Scenic River (Conn.)
1
more ...