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  1. By: Flemming, Stephen P. (Stephen Peter), - Bancroft, Robert P.
    Type: Article
    In: The journal of raptor research
    Volume: 24
    Issue: 1-2
    Date: 1990
    Page Range: 26--27
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Prévost, Yves A. - Bancroft, Robert P. - Seymour, Norman R.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 92
    Issue: 3
    Date: 1978
    Page Range: 294--297
    Publication Info: Ottawa Ottawa Field-Naturalists' Club