Columbia subject headings:
Harvard subject headings:
Italy--History--Sources--Microform catalogs.
Manuscripts on microfilm--Italy--Rome--Catalogs.
Princeton subject headings:
Istituto centrale per il catalogo unico delle biblioteche italiane e per le informazioni bibliografiche--Catalogs.
Manuscripts on microfilm--Italy--Catalogs.
Manuscripts, Italian--Italy--Bibliography--Union lists.
Manuscripts, Italian--Italy--Microform catalogs.