Region
Afghanistan
1
Africa
8
Africa, North
1
Africa, Southern
1
Antarctica
3
Arab countries
4
Argentina
2
Asia
21
Bering Sea
1
Berlin (Germany)
1
Bonin Islands
1
Bonin Islands (Japan)
1
Brazil
2
Bulgaria
2
Burma
2
Cambodia
3
Cambridge (Mass.)
1
Canada
1
Caribbean Area
5
Central America
3
Chile
2
China
38
Communist countries
5
Cuba
13
Cyprus
1
Developing countries
17
Egypt
2
England
1
Europe
13
Europe, Eastern
5
Europe, Western
3
Foreign countries
2
France
8
Germany
9
Great Britain
24
Greece
1
Grenada
1
Illinois
1
India
4
Indochina
1
Indonesia
1
Iran
6
Iraq
2
Israel
10
Italy
3
Iwo Jima (Volcano Islands)
1
Iwo Jima (Volcano Islands, Japan)
1
Japan
12
Kentucky
2
Korea
1
more ...