UNITED STATES DEPARTMENT OF THE INTERIOR 



Stewart L. Udall, Secretary 

 David S. Black, Under Secretary 



Stanley A. Cain, Assistant Secretary for Fish and Wildlife and Parks 

 FISH AND WILDLIFE SERVICE, Clarence F. Pautzke, Commissioner 

 Bureau of Commercial Fisheries, H. E. Crowther, Director 



Wafer Quality of Streams Tributary 

 to Lakes Superior and Michigan 



By 

 JEROME W. ZIMMERMAN 



United States Fish and Wildlife Service 

 Special Scientific Report.-Fisheries No. 559 



Washington, D.C. 

 January 1968 



