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