1. Changes in nutrient and pesticide concentrations in urban and agricultural areas of the South Platte River Basin, Colorado, Wyoming, and Nebraska, 1994-2000 Author/Creator: Sprague, Lori A. Publication/Creation: Denver, Colo. : U.S. Dept. of the Interior, U.S. Geological Survey, 2003 Resource Type: Book Access & Availability: Loading
2. Classification of irrigated land using satellite imagery, the High Plains aquifer, nominal date 1992 Publication/Creation: Denver, Colo. : U.S. Geological Survey, Information Services [distributor] Resource Type: Book Access & Availability: Loading
3. Concentrations and loads of suspended sediment and nutrients in surface water of the Yakima River basin, Washington, 1999-2000 : with an analysis of trends in concentrations Author/Creator: Ebbert, J. C. Publication/Creation: Portland, Or. : U.S. Dept. of the Interior, U.S. Geological Survey, 2003 Resource Type: Book Access & Availability: Loading