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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2014. National Energy Information Center (U.S.). This polygon shapefile contains petroleum administration areas for defense districts (PADDs) within the United States as of 2014. PADDs are geograp... National Energy Information Center (U.S.).