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2. National water quality assessment of the Georgia-Florida Coastal Plain Study Unit : water withdrawals and treated wastewater discharges, 1990
3. National Water-Quality Assessment of the Lake Erie-Lake St. Clair Basin, Michigan, Indiana, Ohio, Pennsylvania, and New York : environmental and hydrologic setting
4. Natural and human factors affecting shallow water quality in surficial aquifers in the Connecticut, Housatonic, and Thames River basins
5. Natural attenuation assessment of contaminated ground water at a gas-turbine manufacturing plant, Greenville, South Carolina
6. Natural attenuation of chlorinated volatile organic compounds in a freshwater tidal wetland, Aberdeen Proving Ground, Maryland
7. Natural attenuation of chlorinated volatile organic compounds in ground water at Operable Unit 1, Naval Undersea Warfare Center, Division Keyport, Washington
8. Natural attenuation of chlorinated volatile organic compounds in ground water at Operable Unit 1, Naval Undersea Warfare Center, Division Keyport, Washington
9. Natural flow and water consumption in the Milk River basin, Montana and Alberta, Canada
10. Natural radioactivity in, and inorganic chemistry of, ground water in the Kirkwood-Cohansey aquifer system, southern New Jersey, 1983-89
11. Near-real-time simulation and internet-based delivery of forecast-flood inundation maps using two-dimensional hydraulic modeling : a pilot study of the Snoqualmie River, Washington
12. A new cation-exchange method for accurate field speciation of hexavalent chromium
13. Nitrate and other water-quality characteristics, and nitrogen in the unsaturated zone, in the Red Willow and Hitchcock counties special protection area, southwest Nebraska, 1993-95
14. Nitrate and pesticides in ground water of the eastern San Joaquin Valley, California : occurrence and trends
15. Nitrate and pesticides in surficial aquifers and trophic state and phosphorus sources for selected lakes, eastern Otter Tail County, west-central Minnesota, 1993-96
16. Nitrate and selected pesticides in ground water of the Mid-Atlantic region
17. Nitrate concentrations, 1936-99, and pesticide concentrations, 1990-99, in the unconfined aquifer in the San Luis Valley, Colorado
18. Nitrate concentrations in ground water in the paleovalley alluvial aquifers of the Nemaha Natural Resources District, Nebraska, 1989 and 1994-96
19. Nitrate in ground water and spring water near four dairy farms in North Florida, 1990-93
20. Nitrate in ground water and stream base flow in the Lower Susquehanna River Basin, Pennsylvania and Maryland
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