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  1. By: Sibley, Charles G - Ahlquist, Jon E
    Type: Article
    In: Bulletin /
    Volume: 39
    Date: 1972-12-01
    Page Range: 1--276
    Publication info: New Haven :Peabody Museum of Natural History,
  2. By: Sibley, Charles G - Ahlquist, Jon E
    Type: Article
    In: The Wilson bulletin.
    Volume: 94
    Issue: 2
    Date: 1982
    Page Range: 114--128
    Publication info: Columbus, Ohio :Wilson Ornithological Society,1894-2005.