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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 :The Museum,
  2. By: Sibley, Ch G - Corbin, Kendall W. - Ahlquist, Jon E
    Type: Article
    In: Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn.
    Volume: 19
    Date: 1968
    Page Range: 235--248
    Publication Info: Bonn :Das Forschungsinstitut
  3. 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-