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200 10$aCharacterization of groundwater quality based on regional geologic setting in the Piedmont and Blue Ridge Physiographic provinces, North Carolina$b[electronic resource] /$fby Stephen L. Harden, Melinda J. Chapman, and Douglas A. Harned ; prepared in cooperation with the North Carolina Department of Environment and Natural Resources, Division of Water Quality, Aquifer Protection Section
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200 10$aOccurrence and distribution of organic chemicals and nutrients and comparison of water-quality data from public drinking-water supplies in the Columbia Aquifer in Delaware, 2000-08$b[electronic resource] /$fby Betzaida Reyes ; prepared in cooperation with the Delaware Department of Natural Resources and Environmental Control and the Delaware Geological Survey
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