Columbia subject headings:
Archivio vaticano--Catalogs.
Archivio vaticano--History--Sources--Catalogs.
Diplomatics.
Manuscripts, Latin (Medieval and modern)--Vatican City--Catalogs.
Papal documents--Catalogs.
Harvard subject headings:
Archivio vaticano
Papacy--History--To 1500--Indexes.
Popes--Sources.
Princeton subject headings: