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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Villiger, Emil,
    Edition: 2. Aufl.
    Publication info: Leipzig, Engelmann, 1910
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
  2. By: Villiger, Emil,
    Publication info: Leipzig, Englemann, 1908
    Holding Institution: MBLWHOI Library