Subject Region
United States
144
Germany
19
Mexico
18
China
17
Southern States
14
Soviet Union
14
Great Britain
13
Russia (Federation)
13
Europe
10
France
10
Latin America
8
Rome
8
Germany (East)
7
Middle East
7
North Carolina
7
Iran
5
Poland
5
Spain
5
Texas
5
Alabama
4
Canada
4
Europe, Eastern
4
Israel
4
Japan
4
Netherlands
4
Andes Region
3
Florida
3
Hong Kong
3
Hong Kong (China)
3
Italy
3
Korea (North)
3
New Jersey
3
Turkey
3
Africa
2
Arab countries
2
Asia, Central
2
Australia
2
Cuba
2
Czechoslovakia
2
Developing countries
2
Egypt
2
Germany (West)
2
Greece
2
Holy Roman Empire
2
Hungary
2
Kentucky
2
Louisiana
2
Massachusetts
2
Mississippi
2
Northeastern States
2
more ...