1. Chemistry and age of groundwater in bedrock aquifers of the Piceance and Yellow Creek Watersheds, Rio Blanco County, Colorado, 2010-12 Author/Creator: McMahon, Peter B., author Publication/Creation: Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 2013 Format: Book Access & Availability: Loading
2. Use of classes based on redox and groundwater age to characterize the susceptibility of principal aquifers to changes in nitrate concentrations, 1991 to 2010 Author/Creator: McMahon, Peter B., author Publication/Creation: Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 2012 Format: Book Access & Availability: Loading
3. Vertical gradients in water chemistry in the central High Plains aquifer, southwestern Kansas and Oklahoma panhandle, 1999 Author/Creator: McMahon, Peter B., author Publication/Creation: Denver, Colorado : U.S. Geological Survey, 2001 Format: Book Access & Availability: Loading
4. Quantity and quality of ground-water discharge to the South Platte River, Denver to Fort Lupton, Colorado, August 1992 through July 1993 Author/Creator: McMahon, Peter B., author Publication/Creation: Denver, Colorado : U.S. Department of the Interior, U.S. Geological Survey, 1995 Format: Book Access & Availability: Loading