Geographic Subject
Amazon River Region
1
Amérique du Nord
2
Asia
2
Baltic Shield
1
Burma
1
Caribbean Area
3
Commonwealth countries
1
Costa Rica
1
Developing countries
2
Egypt
1
Eurasia
1
Europe
3
France
1
Hawaii
1
India
3
Indonesia
2
Japan
1
Karelia
1
Laos
1
Latin America
1
Mekong River Watershed
1
Minnesota
8
New England
1
New Zealand
3
North America
3
Norway
1
Ontario
2
Phuket (Province)
1
Russia (Federation)
2
Scandinavia
1
Siberia, Northeastern
1
Soviet Union
4
Sun
1
Supernova 1987A
1
Thailand
6
Thailand, Northeastern
1
United States
12