Region
United States
207
China
61
France
40
Germany
39
Great Britain
33
Japan
28
Soviet Union
24
Russia
20
Europe
19
England
16
Italy
7
Latin America
7
Massachusetts
7
Spain
5
Developing countries
4
Germany (East)
4
Germany (West)
4
India
4
Paris
4
Taiwan
4
Africa
3
Asia
3
California
3
Cambridge
3
Korea
3
London
3
Mexico
3
New England
3
Paris (France)
3
Shanghai
3
Southern States
3
U.S.
3
Afghanistan
2
Arab countries
2
Beijing
2
Berlin
2
Bristol (Avon)
2
California, Northern
2
Canada
2
Central America
2
English-speaking countries
2
Europe, Western
2
European Economic Community countries
2
FRANCE
2
Foreign countries
2
GERMANY
2
Hong Kong
2
Indonesia
2
Iran
2
Israel
2
more ...