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  1. By: Sopndreal, Marriah L.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 112
    Issue: 2
    Date: 1998
    Page Range: 339--340
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Nenneman, Melvin P. - Grant, Todd A. - Sopndreal, Marriah L. - Murphy, R K
    Type: Article
    In: The journal of raptor research
    Volume: 37
    Issue: 3
    Date: 2003
    Page Range: 246--252
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-