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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Helms, Carl W
    Type: Article
    In: The Wilson bulletin
    Volume: 71
    Issue: 3
    Date: 1959
    Page Range: 244--253
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Helms, Carl W - Smythe, Robert B
    Type: Article
    In: The Wilson bulletin
    Volume: 81
    Issue: 3
    Date: 1969
    Page Range: 280--292
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-