by Peter E. Church ... [and others] ; in cooperation with the U.S. Environmental Protection Agency, Monitoring and Measurement for the 21st Century Initiative
by Richard Bridge Moore ... [and others] ; in cooperation with the New England Interstate Water Pollution Control Commission and U.S. Environmental Protection Agency
by Jennifer G. Savoie ... [and others] ; prepared in cooperation with the Air Force Center for Environmental Excellence and the U.S. Environmental Protection Agency