Region
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Arizona
14
High Plains Aquifer
14
Idaho
14
Italy
14
New York
14
North Dakota
14
Russia
14
Yellowstone National Park
14
Louisiana
13
Missouri River Valley
13
Ohio
13
Utah
13
Virginia
13
Australia
12
Chile
12
Lincoln
12
Northwestern States
12
Pine Ridge Indian Reservation (S.D.)
12
Platte River Watershed
12
Antarctica
11
Nevada
11
New England
11
Omaha (Neb.)
11
Washington (D.C.)
11
Wisconsin
11
Bolivia
10
British Columbia
10
Chicago (Ill.)
10
Cuba
10
Europe, Eastern
10
Florida
10
Loup River
10
Maryland
10
Middle East
10
Caribbean Area
9
Chicago
9
Outer space
9
South Carolina
9
Southwest, Old
9
Arkansas
8
Georgia
8
Iraq
8
Mexico City
8
Michigan
8
Mississippi River Valley
8
Missouri River
8
Pacific Area
8
Poland
8
San Francisco
8
Africa, French-speaking West
7
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