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  1. By: Trigt, Herman van
    Publication info: Leiden, Brill, 1919
    Holding Institution: Smithsonian Libraries and Archives
  2. By: Trigt, Herman van
    Publication info: Rotterdam [Netherlands], Bataafsch Genootschap der Proefondervindelijke Wijsbegeerte te Rotterdam, 1917
    Holding Institution: Smithsonian Libraries and Archives