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  1. By: Sloan, Ronald J. - Smith, Harvey R
    Type: Article
    In: The Canadian field-naturalist
    Volume: 103
    Issue: 3
    Date: 1989
    Page Range: 411--414
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Smith, Harvey R - DeGraaf, Richard M. - Miller, Richard S
    Type: Article
    In: The journal of raptor research
    Volume: 36
    Issue: 2
    Date: 2002
    Page Range: 144--145
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-