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  1. By: Erickson, Albert Windell - Mossman, Harlan W. - Hensel, Richard J. - Troyer, Willard A.
    Type: Article
    In: Zoologica : scientific contributions of the New York Zoological Society
    Volume: 53
    Issue: 7
    Date: 1968-11-29
    Page Range: 85--105
    Publication Info: New York,
  2. By: Knight, Richard L. - Erickson, Albert Windell
    Type: Article
    In: Raptor research
    Volume: 10
    Issue: 4
    Date: 1976
    Page Range: 108--111
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]