1973. Flint, Harold J. Scale approximately 1:510,000. "This map is a revision of the 1968 publication ..." Includes directory of oil pipe line companies and index to gas ... Ohio. Department of Natural Resources.
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1975. Scale approximately 1:2,000,000. "Map available also at a scale of 1 inch = approximately 8 miles." Shows gas and liquid petroleum storage areas, p... Ohio. Division of Geological Survey.