Columbia subject headings:
Catacombs--Italy--Rome--Guidebooks.
Church architecture--Italy--Rome--Guidebooks.
Church buildings--Italy--Rome--Guidebooks.
Rome (Italy)--Buildings, structures, etc.--Guidebooks.
Harvard subject headings:
Basilicas--Italy--Rome--Guidebooks.
Catacombs--Italy--Rome--Guidebooks.
Church buildings--Italy--Rome--Guidebooks.
Rome (Italy)--Buildings, structures, etc.--Guidebooks.
Princeton subject headings:
Catacombs--Italy--Rome--Guidebooks.
Church architecture--Italy--Rome--Guidebooks.
Church buildings--Italy--Rome--Guidebooks.
Guidebooks.
Rome (Italy)--Buildings, structures, etc.--Guidebooks.