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U.S. Geological Survey
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Public
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Penn State
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District Of Columbia, United States
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Year
2011
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1. USGS Geopdfs for District of Columbia
2011. U.S. Geological Survey. Layered GeoPDF 7.5 Minute Quadrangle Map. Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation contours, hydro...