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  1. By: Nachtrieb, Henry F
    Type: Article
    In: Zoologischer Anzeiger
    Volume: 15
    Date: 1892
    Page Range: 147--148
    Publication Info: Jena VEB Gustav Fischer Verlag
  2. By: Nachtrieb, Henry F
    Type: Article
    In: The Annals and magazine of natural history; zoology, botany, and geology
    Volume: 15
    Series: 5
    Date: 1885
    Page Range: 421--425
    Publication Info: London Taylor and Francis, Ltd