Columbia subject headings:
Basilica di San Pietro in Vaticano--History.
Church architecture--Vatican City--History.
Domes--Vatican City--Design and construction.
Vatican City--Buildings, structures, etc.
Harvard subject headings:
Basilica di San Pietro in Vaticano.
Church architecture--Vatican City.
Domes--Vatican City.
Vatican City--Buildings, structures, etc.
Princeton subject headings:
Basilica di San Pietro in Vaticano--History.
Church architecture--Vatican City--History.
Domes--Vatican City--Design and construction.
Vatican City--Buildings, structures, etc.