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  1. By: Sill, W D
    Type: Article
    In: Bulletin of the Museum of Comparative Zoology at Harvard College
    Volume: 146
    Date: 1974
    Page Range: 317--362
    Publication Info: Cambridge, Mass The Museum 1863-
  2. By: Sill, W D
    Type: Article
    In: Bulletin of the Museum of Comparative Zoology at Harvard College
    Volume: 135
    Date: 1967
    Page Range: 415--446
    Publication Info: Cambridge, Mass The Museum 1863-