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By: Lutz, R S - Plumpton, D LType: ArticleIn: The journal of raptor researchVolume: 33Series:Issue: 2Date: 1999Page Range: 149--153Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Plumpton, D L - Downing, D I - Andersen, David E - Lockhart, J MType: ArticleIn: The journal of raptor researchVolume: 29Series:Issue: 2Date: 1995Page Range: 141--143Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Plumpton, D L - Lutz, R SType: ArticleIn: The journal of raptor researchVolume: 27Series:Issue: 4Date: 1993Page Range: 175--179Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: