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 Robert L. Runkel ... [and others] ; prepared in cooperation with San Juan County, San Juan Resource Conservation and Development Council, U.S. Environmental Protection Agency
by Robert L. Runkel ... [and others] ; prepared in cooperation with San Juan County, San Juan Resource Conservation and Development Council, U.S. Environmental Protection Agency
edited by Stanley E. Church, Paul von Guerard, and Susan E. Finger ; prepared in cooperation with the U.S. Department of Agriculture Forest Service, U.S. Bureau of Land Management, U.S. Environmental Protection Agency
by John T. Turk ... [and others] ; prepared in cooperation with the Colorado Department of Health, the U.S. Forest Service, and the U.S. Environmental Protection Agency