Region
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Michigan
4
Middle West
4
New England
4
New Jersey
4
New Zealand
4
Ohio
4
Pacific Area
4
Pennsylvania
4
Slovenia
4
Southeast Asia
4
Turkey
4
Venezuela
4
Allemagne
3
Asie du Sud-Est
3
Australie
3
Egypt
3
Europe centrale
3
Georgia
3
Grande-Bretagne
3
Hungary
3
Ireland
3
Japan
3
Mississippi
3
Missouri
3
Research Triangle Park Region
3
Research Triangle Park Region (N.C.)
3
Romania
3
Russie
3
Saudi Arabia
3
Soviet Union
3
Tennessee
3
Afrika
2
Afrique
2
Andes Region
2
Antioquia (Colombia : Department)
2
Antioquia (Department)
2
Arab countries
2
Asie
2
Atlantic Provinces
2
Austria
2
Belgium
2
Bolivia
2
Bosnia and Herzegovina
2
Caribbean Area
2
Central America
2
Colombie
2
Communist countries
2
Czech Republic
2
Denmark
2
Detroit
2
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