Columbia subject headings:
Excavations (Archaeology)--Vatican City.
Inscriptions, Latin--Vatican City.
Vatican City--Antiquities, Roman.
Vatican City--Historical geography.
Harvard subject headings:
Excavations (Archaeology)--Vatican City.
Vatican City--Antiquities, Roman.
Vatican City--Historical geography.
Princeton subject headings:
Basilica di San Pietro in Vaticano.
Vatican City--Antiquities.
Vatican City--Buildings, structures, etc.
Vatican City--History.