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  1. By: Anthony, Robert G. - Green, Gregory A - Forsman, Eric D - Nelson, S Kim
    Type: Article
    In: The Wilson bulletin
    Volume: 108
    Issue: 2
    Date: 1996
    Page Range: 280--291
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Green, Gregory A - Anthony, Robert G.
    Type: Article
    In: The journal of raptor research
    Volume: 27
    Issue: 1
    Date: 1993
    Page Range: 60--60
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-