Subject Region
United States
838
Soviet Union
199
Europe
168
Great Britain
91
China
68
Developing countries
60
Germany
53
France
43
Middle East
38
Japan
32
Asia
27
Latin America
25
Russia (Federation)
25
India
20
Africa
17
Korea (North)
16
Europe, Eastern
14
Canada
13
East Asia
12
Western countries
12
Former Soviet republics
11
Australia
10
Germany (West)
10
Korea (South)
10
Islamic countries
9
Turkey
9
Europe, Western
8
Spain
8
Cuba
7
BRIC countries
6
Iran
6
Israel
6
Korea
6
Mexico
6
Pacific Area
6
Rome
6
South Africa
6
Southeast Asia
6
Yugoslavia
6
Czechoslovakia
5
Developed countries
5
Eurasia
5
Germany (East)
5
Iraq
5
Italy
5
Mediterranean Region
5
Netherlands
5
Afghanistan
4
Africa, North
4
Asia, Central
4
more ...