by Richard H. Coupe
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Surface-water and streambed-sediment qua...
Pesticide, nutrient, water-discharge and...
Water quality of the tidal Potomac River...
Data-collection methods, quality-assuran...
Nitrate and other water-quality characte...
In-situ bioremediation of nitrate-contam...
Nitrate-nitrogen concentrations in groun...
Water-quality reconnaissance of ground w...
Methods of analysis by the U.S. Geologic...