Gary N. Paulachok

• Geohydrology and ground-water resources of Philadelphia, Pennsylvania
• Hydrologic aspects of the 1998-99 drought in the Delaware River basin
• Hydrologic data for aquifers in Philadelphia, Pennsylvania
• Storm and flood of July 5, 1989, in northern New Castle County, Delaware
• Temperature of ground water at Philadelphia, Pennsylvania, 1979-1981
• U.S. Geological Survey ground-water studies in Delaware
• Water resources of Oley Township, Berks County, Pennsylvania