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By: Speiser, RType: ArticleIn: Zoologische Jahrbücher. SupplementheftVolume: 7Series:Issue:Date: 1904Page Range: 373--380Publication Info: Jena Gustav Fischer 1886-1929Subjects:
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By: Bosakowski, Thomas - Speiser, R - Smith, Dwight G - Niles, L JType: ArticleIn: The journal of raptor researchVolume: 27Series:Issue: 1Date: 1993Page Range: 26--30Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Speiser, R - Bosakowski, ThomasType: ArticleIn: The journal of raptor researchVolume: 25Series:Issue: 4Date: 1991Page Range: 132--135Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: