1. Hydrogeology and subsurface nitrate in the Upper Big Blue Natural Resources District, Central Nebraska, July 1995 through September 1997 Author/Creator: Verstraeten, I. M. (Ingrid Maria), author Publication/Creation: Lincoln, Nebraska : U.S. Department of the Interior, U.S. Geological Survey, 1998 Resource Type: Book Access & Availability: Loading
2. Reconnaissance of ground-water quality in the North Platte Natural Resources District, western Nebraska, June-July 1991 Author/Creator: Verstraeten, I. M. (Ingrid Maria), author Publication/Creation: Lincoln, Nebraska : U.S. Geological Survey, 1995 Resource Type: Book Access & Availability: Loading