Region
United States
14
Great Britain
7
Russia
4
Europe
3
Latin America
3
Europe, Eastern
2
Andes region
1
Australia
1
Central America
1
Communist countries
1
Coventry
1
Developing countries
1
England
1
European Economic Community countries
1
Germany, East
1
India
1
Japan
1
Mexico
1
N¯ asir reservoir region, Egypt and Sudan
1
Papaloapan Valley
1
Soviet Union
1