Columbia subject headings:
Autographs--Vatican City.
Biblioteca apostolica vaticana--Catalogs.
Ferrajoli, Gaetano, -1890--Private collections--Catalogs.
Menozzi, Giacinto--Private collections--Catalogs.
Harvard subject headings:
Autographs--Italy.
Autographs--Vatican City.
Biblioteca apostolica vaticana--Catalogs.
Princeton subject headings:
Autographs--Vatican City--Collections.
Biblioteca apostolica vaticana--Catalogs.
Ferrajoli, Gaetano, -1890--Private collections--Catalogs.
Menozzi, Giacinto--Private collections--Catalogs.