Robert A. Pettijohn

• Geochemistry of ground water in the Gulf Coast aquifer systems, south-central United States
• Hydrologic analysis of the High Plains aquifer system in Box Butte County, Nebraska
• Nature and extent of ground-water-quality changes resulting from solid-waste disposal, Marion County, Indiana
• Processing water-chemistry data, Gulf Coast aquifer systems, south-central United States
• Water-quality variations in Antelope Creek and Deadmans Run, Lincoln, Nebraska