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Framework for regional synthesis of water-quality data for the glacial aquifer system in the United States
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Ground-water quality and select quality-control data from the National Water Quality Assessment Program, January through December 2015, and previously unpublished data from 2013 to 2014
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Groundwater-quality and select quality-control data from the National Water-Quality Assessment Project, January through December 2016, and previously unpublished data from 2013 to 2015
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Relations that affect the probability and prediction of nitrate concentration in private wells in the glacial aquifer system in the United States
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