Approximate location of the 10,000-milligram-per-liter dissolved-solids boundary in the Silurian and Devonian carbonate-rock aquifer, southwestern and northern Indiana
Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 1994
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Approximate location of the 10,000-milligram-per-liter dissolved-solids boundary in the Silurian and Devonian carbonate-rock aquifer, southwestern and northern Indiana / by Douglas J. Schnoebelen [and three others].