Proceedings: second meeting of the second session (reconvened) Duluth, Minnesota, January 14-15, 1971.
Contributors: United States. Environmental Protection Agency. Water Quality Office.
Publisher: Environmental Protection Agency, Water Quality Office
Published: 1971
Place of publication: [Washington]
Language: eng
Number of pages: 401
Subjects: Water -- Pollution -- Superior, Lake, Watershed -- Congresses.
Notes: Cover title.