Subject Region
United States
301
China
48
Australia
21
France
19
Russia (Federation)
18
Great Britain
12
Canada
11
Japan
10
Soviet Union
10
Germany
9
Africa
7
Latin America
7
Mexico
7
South Africa
6
European Union countries
5
Israel
5
Korea (South)
5
Mississippi
5
Africa, Sub-Saharan
4
Athens (Greece)
4
Colombia
4
Cuba
4
Europe
4
India
4
Italy
4
Lebanon
4
New South Wales
4
Palestine
4
Spain
4
Syria
4
Athens
3
Caribbean Area
3
Confederate States of America
3
Egypt
3
Greece
3
Kenya
3
Korea
3
Korea (North)
3
Malaysia
3
Amazon River Valley
2
Boston
2
Boston (Mass.)
2
Brazil
2
Ecuador
2
Espana
2
Georgia
2
India, Northeastern
2
Iran
2
Massachusetts
2
Middle East
2
more ...