Region
United States
204
China
65
France
39
Germany
36
Great Britain
32
Soviet Union
24
Japan
19
Russia
19
Europe
17
England
15
Massachusetts
8
Italy
7
Latin America
6
Developing countries
5
India
5
Arab countries
4
Beijing
4
California
4
Germany (East)
4
Germany (West)
4
Paris
4
Spain
4
Africa
3
California, Northern
3
London
3
Pakistan
3
Paris (France)
3
Southern States
3
Taiwan
3
U.S.
3
Afghanistan
2
Asia
2
Beijing (China)
2
Berlin
2
Cambridge
2
Canada
2
English-speaking countries
2
Foreign countries
2
Hong Kong
2
Islamic countries
2
Israel
2
London (England)
2
Netherlands
2
New England
2
North America
2
Pennsylvania
2
Philadelphia (Pa.)
2
Russia (Federation)
2
Shanghai
2
Shanghai (China)
2
more ...