1. Quality of ground water at selected sites in the upper Mahoning Creek Basin, Pennsylvania Author/Creator: Langland, Michael J. Publication/Creation: [Denver, Colo.] : U.S. Dept. of the Interior, U.S. Geological Survey, [1996] Resource Type: Book Access & Availability: Loading
2. Quality of Ozark streams and ground water, 1992-95 Publication/Creation: [Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, [1999] Resource Type: Book Access & Availability: Loading
3. Questions and answers about the effects of septic systems on water quality in the La Pine area, Oregon Author/Creator: Williams, John S. Publication/Creation: [Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, [2007] Resource Type: Book Access & Availability: Loading