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2. National Water-Quality Assessment Program : nitrate and pesticides in ground water : Blaine, Cassia, Lincoln, and Minidoka counties, south-central Idaho
3. National Water-Quality Assessment Program--Cycle II : regional assessments of aquifers
4. Natural and human factors affecting shallow water quality in surficial aquifers in the Connecticut, Housatonic, and Thames River basins
5. Naturally occurring contaminants in the Piedmont and Blue Ridge cystalline-rock aquifers and Piedmont Early Mesozoic basin siliciclastic-rock aquifers, eastern United States, 1994-2008
6. Nitrate and ammonia in shallow ground water, Carson City urban area, Nevada, 1989
7. Nitrate and pesticides in ground water of the eastern San Joaquin Valley, California : occurrence and trends
8. Nitrate concentrations, 1936-99, and pesticide concentrations, 1990-99, in the unconfined aquifer in the San Luis Valley, Colorado
9. Nitrate in ground water : using a model to simulate the probability of nitrate contamination of shallow ground water in the conterminous United States
10. Nitrate in ground water and stream base flow in the Lower Susquehanna River Basin, Pennsylvania and Maryland
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