Geographic Subject
United States
18
Thailand
9
Minnesota
8
India
7
Russia (Federation)
6
Soviet Union
6
Washington (State)
4
Caribbean Area
3
Developing countries
3
Europe
3
Germany
3
New Zealand
3
North America
3
Ontario
3
Sweden
3
Virginia
3
Wyoming
3
Amérique du Nord
2
Asia
2
Costa Rica
2
Egypt
2
France
2
Mongolia
2
Montana
2
Samoan Islands
2
West Virginia
2
Adélie Coast (Antarctica)
1
Alabama
1
Amazon River Region
1
Asia, Southeastern
1
Austria
1
Baikal, Lake
1
Baikal, Lake, Region (Russia)
1
Baltic Shield
1
Bighorn Basin (Mont. and Wyo.)
1
Brazil
1
Burma
1
Canada
1
Chiang Mai (Thailand : Province)
1
Columbia River
1
Commonwealth countries
1
Cuba
1
Denmark
1
Eurasia
1
Florida
1
Germany (West)
1
Great Britain
1
Guam
1
Hawaii
1
Inde
1
more ...