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  1. By: Petty, S J - Anderson, D. I. K.
    Type: Article
    In: The journal of raptor research
    Volume: 23
    Issue: 3
    Date: 1989
    Page Range: 113--115
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Petty, S J - Shaw, George - Anderson, D. I. K.
    Type: Article
    In: The journal of raptor research
    Volume: 28
    Issue: 3
    Date: 1994
    Page Range: 134--142
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-