2003. Geological Survey (U.S.). Water Resources Division. Wisconsin District. This polygon shapefile contains the shallowest principal aquifers of the conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islan... Geological Survey (U.S.).
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1959. Walker, Alfred C. Prepared by ALFRED C. WALKER, Geologist, Ohio Division of Water, from data compiled by Lawrence R. Brunstetter. Scale bar lower right corner of map... 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.