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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Wolff, Max,
    Type: Article
    In: Zoologischer Anzeiger
    Volume: 37
    Date: 1911
    Page Range: 121--126
    Publication Info: Jena VEB Gustav Fischer Verlag
  2. By: Wolff, Max,
    Type: Article
    In: Zoologische Jahrbücher
    Volume: 41
    Date: 1918
    Page Range: 581--606
    Publication Info: Jena [Germany], G. Fischer,