1. Altitude and configuration of the potentiometric surfaces of the upper and lower aquifer systems in Bridgeton, Nockamixon, and Tinicum townships, Bucks County, Pennsylvania, April 1991 through April 1992 Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Lemoyne, Pennsylvania : U.S. Department of the Interior, U.S. Geological Survey, 1993 Resource Type: Map Access & Availability: Loading
2. Altitude of the potentiometric surface in the Manchester Aquifer at Arnold Air Force Base, May 1991, Coffee and Franklin counties, Tennessee Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Nashville, Tennessee : U.S. Department of the Interior, U.S. Geological Survey, 1993 Resource Type: Map Access & Availability: Loading
3. Altitude and configuration of the potentiometric surface in Springfield Township, Bucks County, Pennsylvania, April 1991 through October 1991 Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Lemoyne, Pennsylvania : U.S. Department of the Interior, U.S. Geological Survey, 1993 Resource Type: Map Access & Availability: Loading