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  1. By: Dugoni, J A - Zwank, Phillip J., ‏ - Furman, Gary C.
    Type: Article
    In: Raptor research
    Volume: 20
    Issue: 3-4
    Date: 1986
    Page Range: 124--127
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Harris, J O - Zwank, Phillip J., ‏ - Dugoni, J A
    Type: Article
    In: The journal of raptor research
    Volume: 21
    Issue: 1
    Date: 1987
    Page Range: 27--31
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-