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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