1959. Walker, Alfred C. Map side also contains legend and explanation of map symbols. "Prepared by ALFRED C. WALKER, Geologist, Ohio Division of Water, from data compiled ... Ohio. Division of Water.
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1959. Walker, Alfred C. 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.
1959. Hollingsworth, John McHenry, 1823-1889 and Kingsbury, Robert C. Detached from: Kingsbury, Robert C. Atlas of Indiana, page 39. Scale approximately 1:2,000,000. Department of Geography, Indiana University.
1959. Bounding Box (W,S,E,N): -93.9791,44.4981,-92.8021,45.361 Ecological Study for the Twin Cities Metropolitan Area.
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