1961. Schmidt, James J. Scale bar lower left corner of map. Map side also contains legend and explanation of map symbols. "Prepared by JAMES J. SCHMIDT, Geologist, Ohio Di... Ohio. Division of Water.
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1961. Walker, Alfred C. 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.
1961. Schmidt, James J. Scale bar lower left corner of map. Text includes information about generalized stratigraphic sequence of the rocks in this portion of the middle S... Ohio. Division of Water.
1961. Schmidt, James J. Map side also contains legend and explanation of map symbols. Scale bar lower right corner of map. "Prepared by JAMES J. SCHMIDT, Geologist, Ohio D... Ohio. Division of Water.
1961. Walker, Alfred C. Prepared by ALFRED C. WALKER, Geologist, Ohio Division of Water Map side also contains legend and explanation of map symbols. Scale bar lower right... Ohio. Division of Water.
1961. Walker, Alfred C. Scale bar lower left corner of map. "Prepared by ALFRED C. WALKER, Geologist, Ohio Division of Water" Map side also contains legend and explanation... Ohio. Division of Water.
1961. Schmidt, James J. 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.
1961. Schmidt, James J. Scale bar lower left corner of map. Text includes information about generalized stratigraphic sequence of the rocks in the Walnut Creek Basin and q... Ohio. Division of Water.
1961. Crawford County Road Commission. Scale approximately 1:120,000; Includes ancillary map of Grayling, location map, and text including a description of "Michigan's Great Divide" betw...