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  1. By: Delong, J P - Hoffman, S W
    Type: Article
    In: The journal of raptor research
    Volume: 38
    Issue: 2
    Date: 2004
    Page Range: 163--168
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Delong, J P - Meehan, T D - Smith, R B
    Type: Article
    In: The journal of raptor research
    Volume: 39
    Issue: 1
    Date: 2005
    Page Range: 19--25
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-