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  1. By: Marks, Jeffrey S. - Leasure, Shawne M
    Type: Article
    In: The Wilson bulletin
    Volume: 104
    Issue: 4
    Date: 1992
    Page Range: 719--731
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Cromrich, Lee A - Holt, Denver W - Leasure, Shawne M
    Type: Article
    In: The journal of raptor research
    Volume: 36
    Issue: 1
    Date: 2002
    Page Range: 58--65
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-