Region
Asia
3
Asia, Central
1
Australia
1
Azerbaijan
2
California
5
Cameroon
1
Canada
3
China
7
Developing countries
6
East Asia
2
Eurasia
1
Europe
1
Europe, Eastern
3
Europe, Western
1
European Union countries
9
Former Soviet republics
1
Germany
3
Great Britain
3
India
1
Japan
1
Kola Peninsula
1
Korea (North)
1
Latin America
6
Louisiana
1
Mediterranean Region
1
Mexico
3
Middle East
1
Mississippi
1
New Mexico
1
Philippines
1
Russia (Federation)
7
South America
1
Southeast Asia
1
Tehuantepec, Isthmus of
3
Texas
1
Ukraine
1
United States
73
Venezuela
1
West (U.S.)
1