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  1. By: Nickerson, W S
    Type: Article
    In: Zoologische Jahrbücher
    Volume: 15
    Date: 1902
    Page Range: 597--624
    Publication Info: Jena [Germany], G. Fischer,
  2. By: Nickerson, W S
    Type: Article
    In: Zoologische Jahrbücher
    Volume: 33
    Date: 1912
    Page Range: 249--256
    Publication Info: Jena [Germany], G. Fischer,