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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Richdale, L E
    Type: Article
    In: The Wilson bulletin
    Volume: 61
    Issue: 2
    Date: 1949
    Page Range: 91--98
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Richdale, L E
    Type: Article
    In: The Wilson bulletin
    Volume: 59
    Issue: 3
    Date: 1947
    Page Range: 160--171
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-