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Bird populations in east central Illinois: fluctuations, variations and development over a half-century
Author: Kendeigh, S. Charles
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Population fluctuations, spatial distribution, and food habits of Rough-legged Hawks in Illinois
Author: Schnell, Gary D.
Call no: RP11596
Year: 1967
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Differential habitat utilization by wintering Rough-legged and Red-tailed Hawks.
Author: Schnell, Gary D.
Call no: RP12633
Year: 1968
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Black-throated gray warbler in Michigan. Rough-legged hawk takes prey from marsh hawk.
Author: Ford, Norman L.
Call no: RP733
Year: 1959
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