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  1. By: De Gregorio, Antonio, marchese,
    Publication info: Palerme :L.P. Lauriel,1886-1930.
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
  2. By: De Gregorio, Antonio, marchese,
    Publication info: Torino :Club Alpino Italiano,1882.
    Holding Institution: Smithsonian Libraries