Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ellenberger, Wilhelm, - Mueller, Carl Friedrich,
    Edition: 8. aufl.
    Publication info: Berlin, 1896
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
  2. By: Ellenberger, Wilhelm, - Baum, Hermann,
    Publication info: Berlin, P. Parey, 1891
    Holding Institution: University of Toronto - Gerstein Science Information Centre