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  1. By: Olendorff, R R
    Type: Article
    In: Raptor research
    Volume: 6
    Issue: 1
    Date: 1972
    Page Range: 6--10
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Kochert, Michael N. (Michael Nicholas) - Olendorff, R R
    Type: Article
    In: The journal of raptor research
    Volume: 33
    Issue: 1
    Date: 1999
    Page Range: 39--42
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-