State of Ohio, Department of Natural Resources, Division of Geological Survey. "Publication date: 02/01." Scale not given. "Larger versions of this map, at scales of 1:1,000,000 and 1:500,000 are available as part of the Digital Chart and Map Series (DCMS)." Shows oil fields, gas fields, and gas storage areas.
This item, made available for research and educational purposes, may be protected by copyright; the user is responsible for making a final determination of copyright status.