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  1. By: Waldeyer-Hartz, Wilhelm von,
    Publication info: [Berlin,1891].
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
  2. By: Waldeyer-Hartz, Wilhelm von,
    Edition: 2. Aufl.
    Publication info: Bonn :F. Cohen,1921.
    Holding Institution: West Virginia University Libraries (archive.org)