Region
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Mexican American Border Region
1
Mississippi River
1
Mississippi River Valley
1
Nevada
1
New Jersey
1
New York
1
Nicaragua
1
North America
1
Oklahoma
1
Penobscot River
1
Russia (Federation)
1
Siberia
1
Tahoe, Lake, Watershed (Calif. and Nev.)
1
Taiwan
1
Texas, South
1
Virginia Key Beach Park (Miami, Fla.)
1
West Virginia
1
White River National Wildlife Refuge
1
White River National Wildlife Refuge (Ark.)
1
Yosemite National Park
1