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Geological Survey (U.S.)
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Shapefile
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United States
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1992
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1. USGS 1:100,000 Topographic Quadrangle Series Index, 1992
1992. Environmental Systems Research Institute (Redlands, Calif.) and Geological Survey (U.S.). This polygon shapefile represents the geographic extent of USGS 1:100,000 topographic maps (30- by 60-minute quadrangles) for the coterminous U.S. ... Environmental Systems Research Institute (Redlands, Calif.).