Columbia subject headings:
Museums--Italy--Rome--Guidebooks.
Museums--Vatican City--Guidebooks.
Rome (Italy)--Buildings, structures, etc.--Guidebooks.
Vatican City--Buildings, structures, etc.--Guidebooks.
Harvard subject headings:
Museums--Italy--Rome--Guidebooks.
Museums--Vatican City--Guidebooks.
Rome (Italy)--Buildings, structures, etc.--Guidebooks.
Vatican City--Buildings, structures, etc.--Guidebooks.
Princeton subject headings:
Guidebooks.
Museums--Italy--Rome--Guidebooks.
Museums--Vatican City--Guidebooks.
Rome (Italy)--Buildings, structures, etc.--Guidebooks.
Vatican City--Buildings, structures, etc.--Guidebooks.