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  1. By: Hellmann, August.
    Publication info: Göttingen : Dieterich, 1817.
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
    Subjects: Anatomy  Serpents  Snakes  Touch  
  2. By: Kidd, Walter Ambrey,
    Publication info: London : A and C. Black, 1907.
    Holding Institution: Smithsonian Libraries
    Subjects: Touch