Subject Region
United States
23
Great Britain
8
Amazon River Region
6
Northwest, Pacific
6
California
5
Tropics
5
Arizona
4
England
4
West (U.S.)
4
Brazil
3
California, Northern
3
Northeastern States
3
Canada
2
Developing countries
2
Great Plains
2
Humboldt County
2
India
2
Montana
2
North America
2
Soviet Union
2
Washington (State)
2
Yellowstone National Park
2
Alaska
1
Appalachian Region, Southern
1
Ariège (France)
1
Australia
1
Bengal
1
Blue Mountains (Or. and Wash.)
1
British Columbia
1
Canada, Eastern
1
China
1
Clayoquot Sound Region
1
Colorado
1
Congo (Democratic Republic)
1
Cumberland River Region (Ky. and Tenn.)
1
Dean, Forest of (England)
1
Ecuador
1
Europe
1
Florida
1
France
1
Germany (East)
1
Gifford Pinchot National Forest
1
Gifford Pinchot National Forest (Wash.)
1
Gila National Forest
1
Gila National Forest (N.M.)
1
Grand Canyon National Park
1
Headwaters Forest Wilderness (Calif.)
1
Idaho
1
Japan
1
Kenya
1
more ...