1. Nitrate in ground water and spring water near four dairy farms in North Florida, 1990-93 Author/Creator: Andrews, William J., 1962- author Publication/Creation: Tallahassee, Florida : U.S. Geological Survey, 1994 Resource Type: Book Access & Availability: Loading
2. Nonlinear-regression flow model of the Gulf Coast aquifer systems in the south-central United States Author/Creator: Kuiper, Logan K., author Publication/Creation: Austin, Texas : U.S. Geological Survey, 1994 Resource Type: Book Access & Availability: Loading
3. Nutrients, suspended sediment, and pesticides in waters of the Red River of the North Basin, Minnesota, North Dakota, and South Dakota, 1970-90 Author/Creator: Tornes, L. H. (Lan H.), author Publication/Creation: Mounds View, Minnesota : U.S. Geological Survey, 1994 Resource Type: Book Access & Availability: Loading