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  1. By: Nehrkorn, Adolph.
    Edition: 2. Aufl.
    Publication info: Berlin,R. Friedler & Sohn,1910.
    Holding Institution: American Museum of Natural History Library
  2. By: Nehrkorn, Adolph - Nehrkorn, Adolph.
    Publication info: Berlin, [Germany] :R. Friedländer & Sohn,1914.
    Holding Institution: Smithsonian Libraries