Columbia subject headings:
Basilica di San Pietro in Vaticano.
Peter, the Apostle, Saint.
Harvard subject headings:
Basilica di San Pietro in Vaticano.
Christian antiquities--Vatican City.
Excavations (Archaeology)--Vatican City.
Peter, the Apostle, Saint--Tomb.
Princeton subject headings:
Basilica di San Pietro in Vaticano.
Christian antiquities--Vatican City.
Excavations (Archaeology)--Vatican City.
Peter, the Apostle, Saint--Tomb.