Geographic Subject
Soviet Union
13
United States
12
Russia (Federation)
8
India
6
Germany
3
Europe
2
Great Britain
2
Japan
2
Sweden
2
5.380
1
Armenia (Republic)
1
Bur︠i︡ati︠i︡a
1
Canada
1
Developing countries
1
Espagne
1
France
1
Israel
1
Malaysia
1
Netherlands
1
New South Wales
1
Pacific Ocean
1
Spain
1
Thailand
1
États-Unis
1