Columbia subject headings:
Catacombs--Italy--Lazio.
Christian antiquities--Italy--Lazio.
Lazio (Italy)--Antiquities.
Harvard subject headings:
Catacombs--Italy--Lazio.
Christian antiquities--Italy--Lazio.
Lazio (Italy)--Antiquities.
Princeton subject headings:
Catacombs--Italy--Lazio.
Christian antiquities--Italy--Lazio.
Lazio (Italy)--Antiquities.