1. Variability of pesticide detections and concentrations in field replicate water samples collected for the National Water-Quality Assessment Program, 1992-97 Author/Creator: Martin, Jeffrey D. Publication/Creation: Indianapolis, Ind. : U.S. Dept. of the Interior, U.S. Geological Survey, 2002 Resource Type: Book Access & Availability: Loading
2. Vertical gradients in water chemistry in the central High Plains aquifer, southwestern Kansas and Oklahoma panhandle, 1999 Author/Creator: McMahon, Peter B., author Publication/Creation: Denver, Colorado : U.S. Geological Survey, 2001 Resource Type: Book Access & Availability: Loading