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Borings --- Geology --- Groundwater --- Water-supply --- Ohio
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Geology --- Groundwater --- Water --- Water-supply --- Composition. --- Ohio
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Mine drainage --- Water --- Water quality --- Pollution --- Ohio. --- Pennsylvania. --- Southern States. --- West Virginia.
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Indians of North America --- Indians of North America --- Say, Thomas, - 1787-1834 --- West (U.S.) --- Ohio River
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Indians of North America --- Arkansas River --- Arkansas --- Oklahoma --- Ohio River --- Mississippi River --- Mississippi (Fleuve) --- Description and travel --- Description and travel
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