produced for the U.S. Environmental Protection Agency by the National Recreation and Park Association, Arlington, Virginia and Design Communication Collaborative, Washington, D.C
by Richard Bridge Moore ... [and others] ; in cooperation with the New England Interstate Water Pollution Control Commission and U.S. Environmental Protection Agency
Conference in the Matter of Pollution of Lake Superior and its Tributary Basin in the States of Minnesota, Wisconsin, and Michigan (1971 : Duluth, Minn.)