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1. USGS 1:250,000 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 1:250,000 topographic maps (1- by 2-degree quadrangles) for the coterminous U.S. fo... Environmental Systems Research Institute (Redlands, Calif.).