prepared by the United States Environmental Protection Agency, Region V and Wisconsin Department of Natural Resources with the assistance of ESEI - Ecolsciences Environmental Group
Conference in the Matter of Progress Meeting of the Conference Concerning Pollution of the Interstate and Intrastate Waters of the Upper Mississippi River and Its Tributaries - Minnesota and Wisconsin (2nd : 1969 : Minneapolis, Minn.)
Progress Evaluation Meeting in the Matter of Pollution of the Interstate and Intrastate Waters of the Upper Mississippi River and Its Tributaries: Minnesota and Wisconsin (1968 : Minneapolis, Minn.)