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  1. By: Drewien, R C - Littlefield, C D - Walkinshaw, Lawrence H. - Braun, Clait E.
    Type: Article
    In: The Wilson bulletin
    Volume: 87
    Issue: 2
    Date: 1975
    Page Range: 297--302
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Littlefield, C D - Thompson, Steven P. - Ehlers, Bradley D.
    Type: Article
    In: Raptor research
    Volume: 18
    Issue: 1
    Date: 1984
    Page Range: 1--5
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]