Richard H. Johnston

• Digital model of the unconfined aquifer in central and southeastern Delaware
• Ground water in the Niagara Falls area, New York, with emphasis on the water-bearing characteristics of the bedrock
• Hydrologic budgets of regional aquifer systems of the United States for predevelopment and development conditions
• Hydrology of the Columbia (Pleistocene) deposits of Delaware
• Planning report for an investigation of ground-water potential in the Mahaweli Basin, Sri Lanka
• Relation of ground water to surface water in four small basins of the Delaware coastal plain
• Summary of the hydrology of the Floridan aquifer system in Florida and in parts of Georgia, South Carolina, and Alabama