by Glenn A. Hearne ... [and others] ; prepared in cooperation with the Colorado Department of Health, U.S. Environmental Protection Agency, and the U.S. Soil Conservation Service
by Eileen P. Poeter [and others] ; prepared in cooperation with the U.S. Environmental Protection Agency and the International Ground Water Modeling Center, Colorado School of Mines
by Jeffrey Steuer ... [and others] ; prepared in cooperation with the Wisconsin Department of Natural Resources and the U.S. Environmental Protection Agency