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.)
prepared for United States Department of the Interior, Bureau of Mines by Ecological Research Services, Inc. in cooperation with Mervin C. Nelson & Associates, Inc. ; [James P. Ludwig ... and others]
produced in partnership by Wisconsin Dept. of Natural Resources Fisheries Management & Water Resources Mgmt. ; a video production of Wisconsin Dept. of Natural Resources Bureau of Information and Education