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By: Varland, Daniel E. - Klaas, E E - Loughin, Thomas MType: ArticleIn: The journal of raptor researchVolume: 25Series:Issue: 1Date: 1991Page Range: 9--17Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Finn, Sean P. - Varland, Daniel E. - Marzluff, J MType: ArticleIn: The journal of raptor researchVolume: 36Series:Issue: 4Date: 2002Page Range: 265--279Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Varland, Daniel E. - Loughin, Thomas MType: ArticleIn: The Wilson bulletinVolume: 105Series:Issue: 3Date: 1993Page Range: 465--474Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Varland, Daniel E. - Loughin, Thomas MType: ArticleIn: The journal of raptor researchVolume: 26Series:Issue: 2Date: 1992Page Range: 74--80Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: