Region
Great Britain
124
United States
54
England
22
Europe
9
China
4
European Union countries
3
Mathematical models
3
Netherlands
3
Canada
2
Developing countries
2
European Economic Community countries
2
Germany
2
India
2
Italy
2
Japan
2
Mexico
2
Russia
2
Sweden
2
Wales
2
Arab countries
1
Australia
1
Belgium
1
California
1
Central America
1
Chicago
1
Communist countries
1
Earth
1
East Asia
1
Europe Union countries
1
Europe, Eastern
1
France
1
Georgia
1
Greece
1
Gt. Brit
1
Hungary
1
Illinois
1
Indonesia
1
Ireland
1
Israel
1
Italy, Southern
1
Kenya
1
Newport Bay
1
Nigeria
1
O.E.C.D. countries
1
Papua New Guinea
1
Philadelphia metropolitan area
1
Poland
1
Punjab (State)
1
Russia (Federation)
1
Scotland
1
more ...