Region
United States
52
China
9
West (U.S.)
6
Europe
3
Great Britain
2
Asia
1
Asia, Central
1
Balkan Peninsula
1
Bangalore
1
Caribbean Area
1
Chile
1
Colorado
1
Connecticut River Valley
1
Developing countries
1
Europe, Central
1
Europe, Eastern
1
Europe, Southern
1
European Union countries
1
Former Soviet republics
1
Idaho
1
India
1
Mexican-American Border Region
1
Middle East
1
North America
1
North Carolina
1
Norway
1
Pakistan
1
Russia (Federation)
1
Russia, Northwestern
1
Santiago (Province)
1
Saudi Arabia
1
Utah
1