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An Introduction to the U.S. Geological Survey's National Water-Quality Assessment Program / Overview of the National Water-Quality Assessment Program / A Nationwide Strategy to Improve Water Quality in the United States / A National Look at Nutrients / Concentrations, Trends, and Loads of Nitrogen and Phosphorus in the Connecticut, Housatonic, and Thames River Basins, 1972-92 / An Assessment of the Increasing Nitrate Trend in the Lower San Joaquin River, California / Factors Affecting Nutrient Concentrations in the White River Basin, Indiana / Comparison of Surface- and Ground-Water Nutrient Concentrations between Urban and Agricultural Land-Use Settings, South Platte River Basin, Colorado / Estimates of Nonpoint- and Point- Source Loadings of Nutrients in NAWQA Basins: What Can They Tell Us? / Nutrient Concentrations Near the Water Table of the Sheyenne Delta Aquifer Beneath Cropland Areas Preliminary Results from the Red River of the North Land-Use Study / Nitrate and Atrazine in Surface Waters of the Upper-Midwestern United States: An Example of Regional Synthesis / National Study Design for Assessing Pesticides in Streams and Ground Water / Inputs of the Dormant Orchard Pesticide, Diazinon, to the San Joaquin River, California / Assessment of Triazine Herbicides in North Carolina and Virginia Streams by an Enzyme-Linked Immunosorbent Assay / Influence of Land Use, Weather, and Watershed Characteristics on Pesticide Concentrations in the White River Basin, Indiana / Occurrence of Pesticides in Nested Watersheds in Virginia and West Virginia /
