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  1. By: Wiggers, Ernie P. - Kritz, Kevin J
    Type: Article
    In: The Wilson bulletin
    Volume: 103
    Issue: 4
    Date: 1991
    Page Range: 568--577
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Renken, Rochelle B - Wiggers, Ernie P.
    Type: Article
    In: The Wilson bulletin
    Volume: 105
    Issue: 1
    Date: 1993
    Page Range: 77--83
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  3. By: Wiggers, Ernie P. - Kritz, K J
    Type: Article
    In: The journal of raptor research
    Volume: 28
    Issue: 1
    Date: 1994
    Page Range: 1--3
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-