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  1. By: Spengel, Johann Wilhelm,
    Publication info: Berlin, Verlag von R. Friedländer & Sohn, 1893
    Holding Institution: Smithsonian Libraries and Archives
  2. By: Huxley, Thomas Henry, - Spengel, Johann Wilhelm,
    Edition: Autorisirte deutsche Ausg. / von J. W. Spengel.
    Publication info: Leipzig, W. Engelmann, 1878
    Holding Institution: Smithsonian Libraries and Archives