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2. Nutrients in ground water and surface water of the United States--an analysis of data through 1992
3. Nutrients and pesticides in ground water of the Ozark Plateaus in Arkansas, Kansas, Missouri, and Oklahoma
4. Numerical simulation of the high plains regional aquifer, northwestern Oklahoma
5. Numerical simulation of the alluvium and terrace aquifer along the north Canadian River from Canton Lake to Lake Overholser, central Oklahoma
6. 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
7. Numerical simulation of ground-water flow in lower Satus Creek Basin, Yakima Indian reservation, Washington
8. Numerical simulation of ground-water flow and assessment of the effects of artificial recharge in the Rialto-Colton basin, San Bernardino County, California
9. Nonpoint-source agricultural chemicals in ground water in Nebraska : preliminary results for six areas of the High Plains aquifer
10. Nonlinear-regression flow model of the Gulf Coast aquifer systems in the south-central United States
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