1. Factors affecting groundwater quality in the Valley and Ridge aquifers, eastern United States, 1993-2002 Publication/Creation: Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2011 Format: Book Access & Availability: Loading
2. Factors affecting specific-capacity tests and their application--a study of six low-yielding wells in fractured-bedrock aquifers in Pennsylvania Author/Creator: Risser, Dennis W., author Publication/Creation: Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 2010 Format: Book Access & Availability: Loading
3. Factors affecting water quality in selected carbonate aquifers in the United States,1993-2005 Publication/Creation: Reston, Va. : U.S. Geological Survey, 2009 Format: Book Access & Availability: Loading