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  1. By: Strebel, Hermann, - Pfeffer, G. (Georg),
    Publication info: Hamburg :G.J. Herbst,1873-1882.
    Holding Institution: Smithsonian Libraries
  2. By: Pfeffer, G. (Georg),
    Publication info: Kiel :Lipsius & Tischer,1912.
    Holding Institution: Smithsonian Libraries