1996. Geological Survey (U.S.). The USGS Central Region Energy Team assessed the oil and gas resources of the United States. Cell maps for each oil and gas production area were cr... U.S. Geological Survey, Central Region Energy Team.
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2000. American Geological Institute, Geological Survey (U.S.), and Environmental Systems Research Institute (Redlands, Calif.). This shapefile includes arcs and polygons that describe U.S. Geological Survey defined geologic provinces of the World. Each province has a set of ... American Geological Institute.