Geographic Subject
Indonesia
119
India
61
United States
44
Japan
42
Germany
32
Russia (Federation)
30
Soviet Union
30
Michigan
25
Switzerland
24
Wisconsin
21
Hawaii
20
France
18
California
15
Netherlands
14
Sweden
13
Brazil
12
Iowa
12
Pennsylvania
12
Poland
12
Maryland
11
Great Britain
10
New York (State)
10
Argentina
9
Cuba
9
Former Soviet republics
8
Kansas
8
Tropics
8
Africa
7
Alabama
7
Indiana
7
North Dakota
7
Texas
7
Thailand
7
Africa, East
6
Australia
6
Canada
6
China
6
Florida
6
Norway
6
Ohio
6
Pakistan
6
Romania
6
Southern States
6
Bangladesh
5
Belgium
5
Bulgaria
5
Israel
5
Italy
5
Malaysia
5
Mexico
5
more ...