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2. Nitrate in ground water and spring water near four dairy farms in North Florida, 1990-93
3. Nitrate and selected pesticides in ground water of the Mid-Atlantic region
4. Nitrate in the Columbia aquifer, central Delmarva Peninsula, Maryland
5. A new cation-exchange method for accurate field speciation of hexavalent chromium
6. Nitrate and pesticides in ground water of the eastern San Joaquin Valley, California : occurrence and trends
7. National Water-Quality Assessment of the Lake Erie-Lake St. Clair Basin, Michigan, Indiana, Ohio, Pennsylvania, and New York : environmental and hydrologic setting
8. Nitrate concentrations in ground water in the paleovalley alluvial aquifers of the Nemaha Natural Resources District, Nebraska, 1989 and 1994-96
9. Nonpoint-source agricultural chemicals in ground water in Nebraska : preliminary results for six areas of the High Plains aquifer
10. Numerical simulation of the alluvium and terrace aquifer along the north Canadian River from Canton Lake to Lake Overholser, central Oklahoma
11. Nitrogen and phosphorus concentrations and fluxes of streams in the Mississippi Embayment Study Unit, 1996-98
12. Nutrient and suspended-sediment concentrations, trends, loads, and yields from the nontidal part of the Susquehanna, Potomac, Patuxent, and Choptank rivers, 1985-96
13. Nutrient loading and selected water-quality and biological characteristics of Dickinson Bayou near Houston, Texas, 1995-97
14. Nutrients and suspended sediment in snowmelt runoff from part of the upper Mississippi River basin, Minnesota and Wisconsin, 1997
15. Nonpoint-source discharges and water quality of the Elk Creek Basin, west-central Wisconsin
16. Nutrient sources and analysis of nutrient water-quality data, Apalachicola-Chattahoochee-Flint River basin, Georgia, Alabama, and Florida, 1972-90
17. Nutrient sources and analysis of nutrient water-quality data, Apalachicola-Chattahoochee-Flint River basin, Georgia, Alabama, and Florida, 1972-90
18. Nutrient loading to Lewisville Lake, north-central Texas, 1984-87
19. Nitrogen, sulfate, chloride, and manganese in ground water in the alluvial deposits of the South Platte River Valley near Greeley, Weld County, Colorado
20. Natural and human factors affecting shallow water quality in surficial aquifers in the Connecticut, Housatonic, and Thames River basins
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