2014. National Energy Information Center (U.S.). This point shapefile represents underground natural gas storage fields in the United States as of July 2014. County centroids are used for map loca... National Energy Information Center (U.S.).
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2001. Ohio. Division of Geological Survey. State of Ohio, Department of Natural Resources, Division of Geological Survey. "Publication date: 02/01." Scale not given. "Larger versions of this... Ohio. Department of Natural Resources.