Geographic Subject
Africa
Asia
9
Congo (Democratic Republic)
6
Soviet Union
6
France
5
Belgium
4
Developing countries
4
Russia
4
Afrique
3
Portugal
3
Africa, East
2
Congo (République démocratique)
2
Elgon, Mount (Uganda and Kenya)
2
India
2
Kenya
2
Morocco
2
Mount Elgon
2
Spain
2
Africa, Portuguese-speaking
1
Afrique du Nord
1
Asie
1
Benin
1
Burkina Faso
1
East Asia
1
Guinea
1
Indochina
1
Libyan Desert
1
Libye, Désert de
1
Madagascar
1
Rhodesia and Nyasaland
1
Senegambia
1
South Africa
1
South America
1
Tropics
1
United States
1
Zambia
1