Hawks and owls
Subtitle: population trends from Illinois Christmas counts
By: Richard R. Graber, Jack S. Golden.
Contributors: Golden, Jack S.; Illinois. Natural History Survey Division
Series: Biological notes -- no. 41
Publisher: State of Illinois, Dept. of Registration and Education, Natural History Survey Division
Published: 1960
Place of publication: Urbana, Ill
Language: eng
Number of pages: 24
Subjects: Hawks -- Illinois; Owls -- Illinois
Notes: Cover title.

"March 1960."

Includes bibliographical references (p. 24).