edited by David A. Nimick, Stanley E. Church, and Susan E. Finger ; prepared in cooperation with the USDA Forest Service and 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