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  1. By: Williams, Laidlaw
    Type: Article
    In: The Wilson bulletin.
    Volume: 54
    Issue: 4
    Date: 1942
    Page Range: 238--249
    Publication info: Columbus, Ohio :Wilson Ornithological Society,1894-
  2. By: Davison, John - Williams, Laidlaw
    Type: Article
    In: The Wilson bulletin.
    Volume: 76
    Issue: 1
    Date: 1964
    Page Range: 10--18
    Publication info: Columbus, Ohio :Wilson Ornithological Society,1894-