Columbia subject headings:
Christian antiquities--Rome.
Liber Pontificalis.
Paul, the Apostle, Saint.
Peter, the Apostle, Saint.
Harvard subject headings:
Christian antiquities--Italy--Rome.
Paul, the Apostle, Saint--Tomb.
Peter, the Apostle, Saint--Tomb.
Princeton subject headings:
Christian antiquities--Italy--Rome.
Paul, the Apostle, Saint--Tomb.
Peter, the Apostle, Saint--Tomb.