Institution: | Department of Geological Sciences, San Diego State University, San Diego, California 92182 (now at New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801).;Department of Geological Sciences, San Diego State University, San Diego, California 92182.;Laboratoire D'Hydrogeologie, Universite de Poiters, 40 avenue du Recteur Pineau, 86022 Poitiers Cedex, France. |