STATE OF ILLINOIS 
William G. Stratton, Governor 
DEPARTMENT OF REGISTRATION AND EDUCATION 
Vera M. Binks, Director 
SOME CONSERVATION PROBLEMS 
OF THE GREAT LAKES 
Harlow B. Mills 
Biological Notes No. 3! 
Printed by Authority of the State of Illinois 
NATURAL HISTORY SURVEY DIVISION 
Harlow B. Mills, Chief 
Urbana, Illinois October, 1953 
