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  1. By: Ris, F. (Friedrich),
    Publication info: Bruxelles,1909-1919
    Holding Institution: Smithsonian Libraries
  2. By: Ris, F. (Friedrich),
    Publication info: London,Printed for the Trustees of the South African Museum by Adlard,1921.
    Holding Institution: Smithsonian Libraries
  3. By: Ris, F. (Friedrich),
    Publication info: Jena,G. Fischer,1909.
    Holding Institution: Smithsonian Libraries