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  1. By: Hussell, David J T - Holroyd, Geoffrey L
    Type: Article
    In: The Canadian field-naturalist
    Volume: 88
    Issue: 2
    Date: 1974
    Page Range: 197--212
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Holroyd, Geoffrey L
    Type: Article
    In: The Canadian field-naturalist
    Volume: 89
    Issue: 1
    Date: 1975
    Page Range: 60--64
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Holroyd, Geoffrey L - Beaubien, Elisabeth G.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 97
    Issue: 4
    Date: 1983
    Page Range: 452--452
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  4. By: Holroyd, Geoffrey L - Banasch, Ursula
    Type: Article
    In: The Canadian field-naturalist
    Volume: 104
    Issue: 2
    Date: 1990
    Page Range: 203--208
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  5. By: Holroyd, Geoffrey L - Rodriguez-Estrella, Ricardo - Sheffield, Steven R
    Type: Article
    In: The journal of raptor research
    Volume: 35
    Issue: 4
    Date: 2001
    Page Range: 399--407
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  6. By: Holroyd, Geoffrey L
    Type: Article
    In: The Canadian field-naturalist
    Volume: 116
    Issue: 1
    Date: 2002
    Page Range: 137--138
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  7. By: Trefry, Helen E. - Holroyd, Geoffrey L
    Type: Article
    In: The Canadian field-naturalist
    Volume: 126
    Issue: 1
    Date: 2012-10-02
    Page Range: 46--49
    Publication Info: Ottawa Ottawa Field-Naturalists' Club