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  1. By: Peterson, Steven R. - Ellarson, Robert S
    Type: Article
    In: The Wilson bulletin
    Volume: 91
    Issue: 2
    Date: 1979
    Page Range: 288--300
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Peterson, Steven R. - Ellarson, Robert S
    Type: Article
    In: The Wilson bulletin
    Volume: 89
    Issue: 1
    Date: 1977
    Page Range: 81--91
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-