Region
United States
26
Great Britain
4
Russia (Federation)
4
Australia
2
China
2
Iraq
2
Afghanistan
1
Asia
1
Bosnia and Hercegovina
1
Canada
1
Congo (Democratic Republic)
1
Developing countries
1
Florida
1
Germany (East)
1
Indonesia
1
Iran
1
Japan
1
Kosovo (Serbia)
1
Mississippi River Valley
1
New England
1
Poland
1
Soviet Union
1
Texas
1
Vietnam
1