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Environment
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Polygon
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Year
1992
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1. United States Major Parks, 1992-1997
1992. United States. National Park Service and Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents National Parks, National Forests, State and local parks and forests within the United States at 1:100,000 scale. ... Environmental Systems Research Institute (Redlands, Calif.).
2. U.S. Major Parks 2008
1992. National Park Service. U.S. Major Parks represents National Parks, National Forests, State and local parks and forests within United States. ESRI.
3. U.S. Major Parks, 2013
1992. National Park Service. U.S. Major Parks represents National Parks, National Forests, State and local parks and forests within the United States.
4. U.S. Parks 2002
1992. National Park Service. U.S. Parks represents National Parks, National Forests, State and local parks and forests within United States. Environmental Systems Research Institute, Inc. (ESRI).