(AC HLEG 
ILLINOIS BIRDS: Hirundinidae 
RICHARD R. GRABER 
JEAN W. GRABER 
ETHELYN L. KIRK 
Biological Notes No. 80 
ILLINOIS NATURAL HISTORY SURVEY 
Urbana, Illinois— August, 1972 
State of Illinois 
Department of Registration and Education 
NATURAL HISTORY SURVEY DIVISION BIOLOGY LIBRARY 
101 BURRILL HALL 
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