Region
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Australia
20
Iran
20
Wisconsin
20
Indiana
19
Maine
19
Mississippi
19
Oklahoma
19
Mexico, Gulf of
18
Montana
18
Vermont
18
Africa
17
France
17
Soviet Union
17
West Virginia
17
Delaware
16
Pacific States
16
Utah
16
Poland
15
Caribbean Area
14
Iowa
14
Kentucky
14
Philadelphia
14
Philippines
14
Taiwan
14
Colorado River (Colo.-Mexico)
13
India
13
Korea (South)
13
Latin America
13
New York (N.Y.)
13
Alabama
12
Cuba
12
Foreign countries
12
Idaho
12
Middle East
12
Columbia River
11
Italy
11
North America
11
Argentina
10
Arkansas
10
Atlantic Ocean
10
Outer space
10
South Dakota
10
American Samoa
9
Appalachian Region
9
Great Lakes (North America)
9
Kansas
9
Netherlands
9
New England
9
Turkey
9
Yucca Mountain
9
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