IC 61, Conversion of the Ohio oil- and gas-well township
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STATE OF OHIO Bob Taft, Governor DEPARTMENT OF NATURAL RESOURCES Samuel W. Speck, Director DIVISION OF GEOLOGICAL SURVEY Thomas M. Berg, Chief Information Circular No. 61 CONVERSION OF THE OHIO OIL- AND GAS-WELL TOWNSHIP-LOCATION MAPS TO A GEOGRAPHIC INFORMATION SYSTEM: HISTORY AND METHODOLOGY by James McDonald, Lawrence H. Wickstrom, Christian D. Steck, and Joseph G. Wells Columbus 2005
