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  1. By: Spiess, C
    Type: Article
    In: Revue suisse de zoologie
    Volume: 11
    Date: 1903
    Page Range: 151--239
    Publication Info: Genève, Kundig [etc.],
  2. By: Spiess, C
    Type: Article
    In: Revue suisse de zoologie
    Volume: 12
    Date: 1904
    Page Range: 585--647
    Publication Info: Genève, Kundig [etc.],