Subject Region
United States
570
European Union countries
33
Great Britain
32
Canada
24
Soviet Union
15
Japan
14
Europe
11
China
10
Developing countries
10
Germany
10
Israel
10
Hiroshima-shi (Japan)
8
Latin America
8
Nagasaki-shi (Japan)
7
Netherlands
7
Afghanistan
6
Australia
6
England
6
France
5
India
5
Iran
5
California
4
Egypt
4
Vietnam
4
Africa
3
Caribbean Area
3
Iraq
3
Mexico
3
Middle East
3
New York (State)
3
North America
3
Northeastern States
3
Pacific Area
3
Southern States
3
America
2
Balkan Peninsula
2
Berlin (Germany)
2
Brazil
2
Central America
2
East Asia
2
Europe, Western
2
European Economic Community countries
2
Florida
2
Lima
2
Lima (Ohio)
2
Ohio
2
Ontario
2
Outer space
2
Québec (Province)
2
Rotterdam
2
more ...