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  1. By: Baker, Maurice F - Eng, Robert L - Gashwiler, Jay S - Schroeder, Max H - Braun, Clait E.
    Type: Article
    In: The Wilson bulletin
    Volume: 88
    Issue: 1
    Date: 1976
    Page Range: 165--171
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Eng, Robert L - Gullion, Gordon W
    Type: Article
    In: The Wilson bulletin
    Volume: 74
    Issue: 3
    Date: 1962
    Page Range: 227--242
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-