Columbia subject headings:
Architecture--Italy--Rome--History.
Basilica di San Pietro in Vaticano--History.
Domes--Conservation and restoration--Vatican City.
Vatican City--Buildings, structures, etc.
Harvard subject headings:
Architecture--Italy--Rome--History.
Basilica di San Pietro in Vaticano--History.
Domes--Conservation and restoration--Vatican City.
Vatican City--Buildings, structures, etc.
Princeton subject headings:
Architecture--Italy--Rome--History--18th century.
Basilica di San Pietro in Vaticano--History.
Domes--Conservation and restoration--Vatican City.
Vatican City--Buildings, structures, etc.