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  1. By: Helgen, Kristofer M. - Mcfadden, T L
    Type: Article
    In: Bulletin of the Museum of Comparative Zoology at Harvard College
    Volume: 157
    Date: 2001
    Page Range: 93--181
    Publication Info: Cambridge, Mass The Museum 1863-
  2. By: Helgen, Kristofer M. - Mcfadden, T L
    Type: Article
    In: Breviora
    Volume: 510
    Date: 2002
    Page Range: 1--13
    Publication Info: Cambridge, Mass Museum of Comparative Zoology, Harvard University [1952-