Geographic Subject
Soviet Union
9
Russia (Federation)
8
Indonesia
7
Russia, Northern
4
Developing countries
3
India
3
Pakistan
3
Bangladesh
2
Thailand
2
Africa
1
Brazil
1
Germany (West)
1
Great Britain
1
Gulf Region
1
Hungary
1
Jawa Timur
1
Nepal
1
Nova Scotia
1
Sakha
1
Siberia
1
Siberia, Western
1
Sweden
1
Texas
1
United States
1
Ural Mountains Region
1