produced for the U.S. Environmental Protection Agency by the National Recreation and Park Association, Arlington, Virginia and Design Communication Collaborative, Washington, D.C
Conference in the Matter of Pollution of Lake Superior and its Tributary Basin in the States of Minnesota, Wisconsin, and Michigan (1971 : Duluth, Minn.)
by Bradford Butman ... [and others] ; prepared in cooperation with the U.S. Environmental Protection Agency under cooperative agreement CX-813547-01-0 with the Woods Hole Oceanographic Institution