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  1. By: Graul, Walter D
    Type: Article
    In: The Wilson bulletin
    Volume: 85
    Issue: 1
    Date: 1973
    Page Range: 60--70
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Graul, Walter D
    Type: Article
    In: The Wilson bulletin
    Volume: 86
    Issue: 3
    Date: 1974
    Page Range: 221--229
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-