1. Magnitude, extent, and potential sources of nitrate in ground water in the Gallatin Local Water Quality District, southwestern Montana, 1997-98 Author/Creator: Kendy, Eloise, author Publication/Creation: Helena, MT : U.S. Department of the Interior, U.S. Geological Survey, 2001 Resource Type: Book Access & Availability: Loading
2. Monitoring regional ground-water quality--statistical considerations and description of a monitoring network in Kansas Author/Creator: Spruill, T. B., author Publication/Creation: Lawrence, Kansas : U.S. Geological Survey, 1990 Resource Type: Book Access & Availability: Loading