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A map displaying the Shale Plays of North America.
From the site: "This report describes new digital maps delineating areas of the United States, including Puerto Rico and the U.S. Virgin Islands,...
A map displaying the Lower 48 States Shale Plays.
Interactive maps and downloadable data for regional and global Geology, Geochemistry, Geophysics, and Mineral Resources, provided by USGS. Multiple...
A distributed archive of standardized geoscience spatial information and data for the nation. Developed by the USGS and State Geological Surveys.
From the site: "Layered GeoPDF 7.5 Minute Quadrangle Map. Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation...
USGS GIS data of the United States water resources maps, soil, hydrology, and weather. Contains multiple links to useful and informative websites.