Exner, M. E., Spalding, R. F., 1976. Groundwater Quality of the Central Platte Region, 1974 (RA-2): 48 pp., size 8.5" x 11". Description: The purpose of this atlas is twofold: 1) describe what major chemical constituents are in the regional aquifer, and 2) to delineate where they are most concentrated. In addition, some general interpretations concerning why variations in concentration of individual chemical constituents occur in certain areas within the region are included. Out of print, unbound copy available.