by Peter E. Church ... [and others] ; in cooperation with the U.S. Environmental Protection Agency, Monitoring and Measurement for the 21st Century Initiative
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