Region
Afghanistan
1
Africa
2
Arab countries
1
Australia
2
Azerbaijan
1
Baltic States
3
Berlin
3
Berlin (Germany)
3
Canada
1
Caribbean Area
1
Central America
1
China
2
Communist countries
1
Cuba
4
Czechoslovakia
1
Developing countries
1
Egypt
1
Europe, Eastern
4
Europe, Western
1
Former Soviet republics
1
Germany
3
Germany (East)
2
Germany (West)
4
Hungary
1
Iran
3
Israel
2
Kazakhstan
1
Latin America
2
Liberia
2
Mexico
2
Middle East
2
Russia
1
Russia (Federation)
3
Soviet Union
Ukraine
4
United States
24
Venezuela
2
Western Europe
1
World politics
1
Yugoslavia
1