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Karst in the United States: A Digital Map Compilation and Database
From the site: "This report describes new digital maps delineating areas of the United States, including Puerto Rico and the U.S. Virgin Islands, having karst or the potential...-
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Pennsylvania Spatial Data: USGS Geopdfs
From the site: "Layered GeoPDF 7.5 Minute Quadrangle Map. Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation contours, hydrography, and...-
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National Geologic Map Database
A distributed archive of standardized geoscience spatial information and data for the nation. Developed by the USGS and State Geological Surveys.-
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