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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Tetens, H.
    Type: Article
    In: Entomologische Nachrichten
    Volume: 26
    Date: 1900
    Page Range: 296--298
    Publication Info: Berlin [etc.], R. Friedländer [etc.],
  2. By: Tetens, H.
    Type: Article
    In: Entomologische Nachrichten
    Volume: 17
    Date: 1891
    Page Range: 369--384
    Publication Info: Berlin [etc.], R. Friedländer [etc.],