G. E Groschen

• Hydrogeologic factors that affect the flowpath of water in selected zones of the Edwards Aquifer, San Antonio region, Texas
• Hydrogeologic framework and geochemistry of the Edwards Aquifer saline-water zone, south-central Texas
• Simulated effects of projected pumping on the availability of freshwater in the Evangeline aquifer in an area southwest of Corpus Christi, Texas
• Simulation of ground-water flow and the movement of saline water in the Hueco bolson aquifer, El Paso, Texas, and adjacent areas
• Water quality in the upper Illinois River Basin, Illinois, Indiana, and Wisconsin, 1999-2001