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2. Numerical simulation of the alluvium and terrace aquifer along the north Canadian River from Canton Lake to Lake Overholser, central Oklahoma
3. Nitrate in the Columbia aquifer, central Delmarva Peninsula, Maryland
4. Nitrogen, sulfate, chloride, and manganese in ground water in the alluvial deposits of the South Platte River Valley near Greeley, Weld County, Colorado
5. Numerical simulation of the high plains regional aquifer, northwestern Oklahoma
6. Nonpoint-source discharges and water quality of the Elk Creek Basin, west-central Wisconsin
7. Natural flow and water consumption in the Milk River basin, Montana and Alberta, Canada
8. Numerical simulation of advective-dispersive multisolute transport with sorption, ion exchange, and equilibrium chemistry
9. Nonpoint-source agricultural chemicals in ground water in Nebraska : preliminary results for six areas of the High Plains aquifer
10. Nitrogen transport in a shallow outwash aquifer at Olean, Cattaraugus County, New York
11. Nomenclature of regional hydrogeologic units of the Southeastern Coastal Plain aquifer system
12. A numerical solution for the diffusion equation in hydrogeologic systems
13. Nitrate in ground water and spring water near four dairy farms in North Florida, 1990-93
14. Nonlinear-regression flow model of the Gulf Coast aquifer systems in the south-central United States
15. Nutrients, suspended sediment, and pesticides in waters of the Red River of the North Basin, Minnesota, North Dakota, and South Dakota, 1970-90
16. Natural radioactivity in, and inorganic chemistry of, ground water in the Kirkwood-Cohansey aquifer system, southern New Jersey, 1983-89
17. Numerical simulation of regional changes in ground-water levels and in the freshwater-saltwater interface induced by increased pumpage at Barbers Point Shaft, Oahu, Hawaii
18. Nutrient loading to Lewisville Lake, north-central Texas, 1984-87
19. Nutrients in ground water and surface water of the United States--an analysis of data through 1992
20. National water quality assessment of the Georgia-Florida Coastal Plain Study Unit : water withdrawals and treated wastewater discharges, 1990
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