Region
prev ...
Morocco
1
New England
1
New Mexico
1
Niger
1
North America
3
Norway
1
Pacific Area
1
Pakistan
1
Pennsylvania
1
Persian Gulf States
1
Philippines
1
Romania
1
Russia (Federation)
9
Russia, Northern
1
Sierra Leone
1
South Africa
1
South America
2
South Asia
1
Southeast Asia
3
Soviet Union
4
Tehuantepec, Isthmus of
3
Texas
6
Trinidad
2
Trinidad and Tobago
2
Ukraine
4
United Arab Emirates
1
United States
332
Venezuela
1
West (U.S.)
2
West Virginia
3
Wyoming
1