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Groundwater
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United States
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1. Hydrologic investigations atlas
Geological Survey (U.S.). U.S. Geological Survey,.
2. Nitrate in ground water using a model to simulate the probability of nitrate contamination of shallow ground water in the conterminous United States /
Hitt, Kerie J. U.S. Dept. of the Interior, U.S. Geological Survey,.
3. Principal Aquifers of the 48 Conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands
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.).