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  1. By: Ridley, Henry Nicholas,
    Publication info: [London :Academic Press],1890.
    Holding Institution: Smithsonian Libraries
  2. By: Ridley, Henry Nicholas,
    Publication info: London,Macmillan and co., limited,1912
    Holding Institution: Smithsonian Libraries
  3. By: Ridley, Henry Nicholas,
    Publication info: London,Macmillan, Ltd.,1912.
    Holding Institution: University of California Libraries (archive.org)