Subject Region
United States
66
Great Britain
20
Developing countries
7
Japan
7
East Asia
6
Canada
5
England
5
France
5
Europe
4
China
3
Ireland
3
New York (State)
3
Australia
2
Boston
2
Chile
2
European Economic Community countries
2
European Union countries
2
London (England)
2
Massachusetts
2
Espana
1
Europe, Central
1
Europe, Eastern
1
Latin America
1
Madagascar
1
New Jersey
1
Pennsylvania
1
Spain
1
West Indies, British
1