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Redox conditions in selected principal aquifers of the United States
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Use of classes based on redox and groundwater age to characterize the susceptibility of principal aquifers to changes in nitrate concentrations, 1991 to 2010
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Use of diverse geochemical data sets to determine sources and sinks of nitrate and methane in groundwater, Garfield County, Colorado, 2009
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Vertical gradients in water chemistry and age in the northern High Plains Aquifer, Nebraska, 2003
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Vertical gradients in water chemistry in the central High Plains aquifer, southwestern Kansas and Oklahoma panhandle, 1999
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Water-quality assessment of the High Plains aquifer, 1999-2004
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