Region
United States
37
Asia
9
Great Britain
9
Europe
8
Pennsylvania
8
Developing countries
7
Pacific Area
7
Canada
6
Japan
6
Latin America
6
Middle East
6
Soviet Union
6
Germany
5
Sri Lanka
5
Caribbean Area
4
Commonwealth countries
4
England
4
Hungary
4
Ireland
4
Israel
4
Philadelphia
4
Taiwan
4
China
3
Europe, Eastern
3
France
3
Spain
3
Africa
2
Austria
2
California
2
États-Unis
2
Foreign countries
2
Germany (West)
2
Greece
2
India
2
Islamic countries
2
Los Angeles
2
New Jersey
2
OECD countries
2
Philadelphia (Pa.)
2
Romania
2
Switzerland
2
Wales
2
West Virginia
2
AMERICA LATINA
1
Africa, North
1
Africa, Southern
1
Algeria
1
Amérique latine
1
Amsterdam (Netherlands)
1
Asia, Central
1
more ...