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  1. By: Varland, Daniel E. - Klaas, E E - Loughin, Thomas M
    Type: Article
    In: The journal of raptor research
    Volume: 25
    Issue: 1
    Date: 1991
    Page Range: 9--17
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Finn, Sean P. - Varland, Daniel E. - Marzluff, J M
    Type: Article
    In: The journal of raptor research
    Volume: 36
    Issue: 4
    Date: 2002
    Page Range: 265--279
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. By: Varland, Daniel E. - Loughin, Thomas M
    Type: Article
    In: The Wilson bulletin
    Volume: 105
    Issue: 3
    Date: 1993
    Page Range: 465--474
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  4. By: Varland, Daniel E. - Loughin, Thomas M
    Type: Article
    In: The journal of raptor research
    Volume: 26
    Issue: 2
    Date: 1992
    Page Range: 74--80
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-