1. Use of isotopes to identify sources of ground water, estimate ground-water-flow rates, and assess aquifer vulnerability in the Calumet Region of northwestern Indiana and northeastern Illinois Author/Creator: Kay, Robert T. Publication/Creation: Denver, CO : U.S. Geological Survey, Branch of Information Services [distributor]. Resource Type: Book Access & Availability: Loading
2. Use of isotopic data to evaluate recharge and geologic controls on the movement of ground water in Las Posas Valley, Ventura County, California Author/Creator: Izbicki, John A., author Publication/Creation: Sacramento, California : U.S. Geological Survey, 1997 Resource Type: Book Access & Availability: Loading