Currently there are 6 of the 37 signatures in the collection digitized. The genesis of the collection came from the Ospizio di S. Stefano dei Mori/S. Stefano degli Abissini in Rome, through ownership by the Chapter of the Vatican in 1729 to the Propaganda Fide in 1759. These manuscripts are Borg.et.2, 3, 28, 29, 31, 36, 37. Manuscripts Borg.et.22-27 came from Stefano Borgia's collection and Borg.et.35 was his personal donation while still Secretary.
Biblioteca apostolica vaticana. (2011). Guida ai fondi manoscritti, numismatici, a stampa della Biblioteca vaticana. Biblioteca apostolica vaticana. pp. 369-370
