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  1. By: Wakelyn, L. A. - Shank, C C - Elkin, B. T. - Dragon, D. C.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 113
    Issue: 2
    Date: 1999
    Page Range: 215--220
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Cotter, R C - Boag, David A. (David Archibald), - Shank, C C
    Type: Article
    In: The journal of raptor research
    Volume: 26
    Issue: 3
    Date: 1992
    Page Range: 146--151
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-