United States Environmental Protection Agency ; National Effluent Toxicity Assessment Center, Environmental Research Laboratory - Duluth, Office of Water Enforcement and Permits, Office of Water Regulations and Standards, Office of Health and Environmental Assessment - Cincinnati
prepared by Environmental Research & Technology, Inc. ; principal investigators, P.K. Mueller, G.M. Hidy ; with assistance from R.L. Baskett ... [and others] ; prepared for Electric Power Research Institute