Geography
Soviet Union
United States
4 results
Afghanistan
3 results
China
3 results
Developing countries
3 results
Germany
3 results
Vietnam
3 results
Africa
2 results
Africa, Sub-Saharan
2 results
Cuba
2 results
Europe, Eastern
2 results
Middle East
2 results
America
1 results
Asia
1 results
Central America
1 results
Communist countries
1 results
Eastern Europe
1 results
Egypt
1 results
Europe
1 results
Former Soviet republics
1 results
Germany (East)
1 results
Indonesia
1 results
Latin America
1 results
South America
1 results
Southeast Asia
1 results
Spain
1 results