Geographic Subject
Africa
Asia
55
Soviet Union
13
Developing countries
9
Afrique
5
Portugal
5
United States
4
Russia
3
Africa, Sub-Saharan
2
China
2
Egypt
2
Europe
2
Great Britain
2
Latin America
2
Middle East
2
Africa, North
1
Australia
1
Cuba
1
Czechoslovakia
1
East Asia
1
European Economic Community countries
1
Foreign countries
1
Germany (East)
1
Germany (West)
1
Israel
1
Italy
1
Liberia
1
Mediterranean Region
1
Nigeria
1
Nubia
1
Oceania
1
Scandinavia
1
South Africa
1