1. 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
2. Regional ground-water flow in upper and middle Paleozoic rocks in southeastern Utah and adjacent parts of Arizona, Colorado, and New Mexico Author/Creator: Weiss, Emanuel, author Publication/Creation: Denver, Colorado : U.S. Geological Survey, 1991 Resource Type: Book Access & Availability: Loading
3. Rock-stratigraphic nomenclature, lithology, and subcrop area of the Galena-Platteville bedrock unit in Illinois and Wisconsin Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 1997 Resource Type: Map Access & Availability: Loading