Geographic Subject
India
127
Russia (Federation)
73
United States
67
Soviet Union
53
Sweden
40
France
27
Germany
27
England
19
Africa
16
Switzerland
16
Siberia
15
Great Britain
14
Poland
13
Indonesia
11
Middle East
11
Thailand
11
Europe
10
Iran
10
Pakistan
10
Asia
9
Nepal
9
Africa, West
8
Canada
8
China
8
Finland
8
Palestine
8
Russian Far East
8
America
7
Egypt
7
Italy
7
Malaysia
7
Texas
7
Bangladesh
6
Denmark
6
Developing countries
6
Japan
6
Mexico
6
Mississippi River Valley
6
Netherlands
6
South Africa
6
Ukraine
6
Ural Mountains Region
6
West (U.S.)
6
Asia, Central
5
Greece
5
Latin America
5
Latvia
5
Louisiana
5
Mongolia
5
Pennsylvania
5
more ...