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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Krohn, August David,
    Publication info: Heidelberg, J. Groos, 1849
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
  2. By: Krohn, August David,
    Publication info: Leipzig, W. Engelmann, 1860
    Holding Institution: MBLWHOI Library