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  1. By: Buchanan, Joseph B. - Schick, Charles T. - Brennan, Leonard A. (Leonard Alfred), - Herman, S G
    Type: Article
    In: The journal of raptor research
    Volume: 25
    Issue: 2
    Date: 1991
    Page Range: 43--44
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Schick, Charles T.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 106
    Issue: 2
    Date: 1992
    Page Range: 260--262
    Publication Info: Ottawa Ottawa Field-Naturalists' Club