Affiliation: | Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831–6038. (Present address: Department of Geology, Washington State University, Pullman, Washington 99164–2812.);Department of Geology, Washington State University, Pullman, Washington 99164–2812.;USDA-ARS, Land Management and Water Conservation Research Unit, Washington State University, Pullman, Washington 99164–2910. |