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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Gerstell, Arnold T. - Trost, Charles H. (Charles Henry),
    Type: Article
    In: The journal of raptor research
    Volume: 29
    Issue: 2
    Date: 1995
    Page Range: 99--102
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Hunt, W Grainger - Jenkins, J M - Jackman, Ronald E - Thelander, Carl G. - Gerstell, Arnold T.
    Type: Article
    In: The journal of raptor research
    Volume: 26
    Issue: 4
    Date: 1992
    Page Range: 243--256
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-