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  1. By: Stalmaster, M V - Kaiser, J L - Skagen, S K
    Type: Article
    In: The journal of raptor research.
    Volume: 27
    Issue: 1
    Date: 1993
    Page Range: 93--93
    Publication info: Hastings, Minn. :Raptor Research Foundation,©1987-
  2. By: Henny, C J - Kaiser, J L
    Type: Article
    In: The journal of raptor research.
    Volume: 29
    Issue: 1
    Date: 1995
    Page Range: 58--58
    Publication info: Hastings, Minn. :Raptor Research Foundation,©1987-