1960. Cummins, James W. Prepared by ALFRED C. WALKER, Geologist, Ohio Division of Water Map side also contains legend and explanation of map symbols. Text includes informa... Ohio. Division of Water.
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1960. Cummins, James W. Map side also contains legend and explanation of map symbols. Text includes information about generalized stratigraphic sequence of the rocks in th... Ohio. Division of Water.
1960. Cummins, James W. Scale bar lower left corner of map. Text includes information about generalized stratigraphic sequence of the rocks in the middle Mahoning River Ba... Ohio. Division of Water.
1960. Cummins, James W. Scale bar lower left corner of map. Map side also contains legend and explanation of map symbols. Text includes information about generalized strat... Ohio. Division of Water.