STATE OF ILLINOIS DEPARTMENT OF REGISTRATION AND EDUCATION 
William G. Stratton, Governor Vera M. Binks, Director 
HAWKS AND OWLS: 
Population Trends From 
Illinois Christmas Counts 
Richard R. Graber 
Jack S. Golden 
Biological Notes No. 41 
Printed by Authority of the State of Illinois 
~ March, 1960 
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NATURAL HISTORY SURVEY DIVISION 
Harlow B. Mills, Chief Urbana, Illinois 
