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1. United States Geological Survey (USGS) 1:24,000 Topographic Quadrangle Series Index, 2010

1992. Economic and Social Research Institute (Reston, Va.). United States Geological Survey (USGS) 1:24,000 Topographic Quadrangle Series Index is a polygon theme representing the geographic extent of USGS 1... ESRI.

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.