Columbia subject headings:
Catacombs--Italy--Rome.
Christian martyrs--Tombs--Italy--Rome.
Cimitero di Callisto (Rome, Italy)
Marcellinus, Saint, -304--Tomb.
Harvard subject headings:
Catacombs--Italy--Rome
Cemeteries--Italy--Rome.
Christian antiquities--Italy--Rome.
Christian cemeteries--Italy--Rome.
Christian martyrs--Tombs--Italy--Rome.
Cimitero di Callisto (Rome, Italy)
Marcellinus, Saint, -304--Tomb.
Princeton subject headings:
Catacombs--Italy--Rome.
Cemeteries--Italy--Rome.
Christian antiquities--Italy--Rome.
Christian cemeteries--Italy--Rome.
Christian martyrs--Tombs--Italy--Rome.
Cimitero di Callisto (Rome, Italy)