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By: Hussell, David J T - Holroyd, Geoffrey LType: ArticleIn: The Canadian field-naturalistVolume: 88Series:Issue: 2Date: 1974Page Range: 197--212Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Holroyd, Geoffrey L - Rodriguez-Estrella, Ricardo - Sheffield, Steven RType: ArticleIn: The journal of raptor researchVolume: 35Series:Issue: 4Date: 2001Page Range: 399--407Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Trefry, Helen E. - Holroyd, Geoffrey LType: ArticleIn: The Canadian field-naturalistVolume: 126Series:Issue: 1Date: 2012-10-02Page Range: 46--49Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Holroyd, Geoffrey LType: ArticleIn: The Canadian field-naturalistVolume: 116Series:Issue: 1Date: 2002Page Range: 137--138Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Holroyd, Geoffrey LType: ArticleIn: The Canadian field-naturalistVolume: 89Series:Issue: 1Date: 1975Page Range: 60--64Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Holroyd, Geoffrey L - Banasch, UrsulaType: ArticleIn: The Canadian field-naturalistVolume: 104Series:Issue: 2Date: 1990Page Range: 203--208Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Holroyd, Geoffrey L - Beaubien, Elisabeth G.Type: ArticleIn: The Canadian field-naturalistVolume: 97Series:Issue: 4Date: 1983Page Range: 452--452Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects: