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  1. By: Société fribourgeoise des sciences naturelles
    Publication info: Fribourg, Imprimerie Ant. Henseler, 1880-
    Holding Institution: Smithsonian Libraries and Archives
  2. By: Société fribourgeoise des sciences naturelles
    Publication info: Fribourg (Suisse), 1901-1947
    Holding Institution: University Library, University of Illinois Urbana Champaign