STRUCTURE OF THE BEREA OIL SAND IN THE .
STRUCTURE OF THE BEREA OIL SAND IN THE SUMMERFIELD QUADRANGLE, GUERNSEY, NOBLE, AND MONROE COUN TIES, OHIO. By D. DALE CONDIT. INTRODUCTION. Within the last 12 years the United States Geological Survey has, from time to time, been engaged in mapping the structural features
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