Areas susceptible to irrigation-induced selenium contamination of water and biota in the western United States : by Ralph L. Seiler, Joseph P. Skorupa, and Lorri A. Peltz ; prepared in cooperation: U.S. Geological Survey, U.S. Fish and Wildlife Service, Bureau of Reclamation, Bureau of Indian Affairs. - Seiler, R. L. (U.S. Dept. of the Interior, U.S. Geological Survey, 1999)