A large collection of original correspondence, press cuttings, telegrams and other material 1920s - 1960s presented in three ring binders; also, in 12 Archive folders, published articles and booklets by Porro on most aspects of Italian (and general) aviation 1922-1962 from the ‘Archivio Aeronautico Caproni di Taliedo’. Most of the booklets have the Biblioteca Caproni numbered access labels.