Region
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Wales
4
Washington (State)
4
Arkansas
3
Egypt
3
Illinois
3
Israel
3
Kentucky
3
Melanesia
3
Nebraska
3
New York
3
North Carolina
3
Oaxaca (Mexico : State)
3
Oaxaca (State)
3
Ohio
3
Oregon
3
Philippines
3
South Africa
3
Southeast Asia
3
West (U.S.)
3
Aegean Sea
2
Amsterdam
2
Bahamas
2
Blood Indian Reserve (Alta.)
2
Buenos Aires
2
Canada, Northern
2
Catalonia
2
Caucasus, South
2
Chevelon Canyon
2
Chevelon Canyon (Ariz.)
2
Colorado
2
Crete
2
Delaware River Watershed (N.Y.-Del. and N.J.)
2
Eurasia
2
Europe, Central
2
Hanford Site (Wash.)
2
Ireland
2
Islamic countries
2
Ithaca
2
Japan
2
Jordan
2
London
2
Malawi
2
Malay Archipelago
2
Malaysia
2
Massachusetts
2
Miami
2
Middle West
2
New Guinea
2
New Jersey
2
Nigeria
2
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