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By: Ritchie, Robert J - Doyle, T J - Wright, John M.Type: ArticleIn: The journal of raptor researchVolume: 32Series:Issue: 3Date: 1998Page Range: 261--264Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Ritchie, Robert J - Wildman, Ann M. - White, Clayton M.Type: ArticleIn: The journal of raptor researchVolume: 38Series:Issue: 2Date: 2004Page Range: 158--160Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Ritchie, Robert J - Burgess, Robert M. - Suydam, Robert S.Type: ArticleIn: The Canadian field-naturalistVolume: 114Series:Issue: 3Date: 2000Page Range: 395--404Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Ritchie, Robert J - Ambrose, Robert E.Type: ArticleIn: The Canadian field-naturalistVolume: 106Series:Issue: 3Date: 1992Page Range: 316--320Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Ritchie, Robert J - Ambrose, Robert E.Type: ArticleIn: The Canadian field-naturalistVolume: 92Series:Issue: 3Date: 1978Page Range: 293--293Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Ritchie, Robert J - Ambrose, Robert E.Type: ArticleIn: The Canadian field-naturalistVolume: 101Series:Issue: 1Date: 1997Page Range: 86--87Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects: