Columbia subject headings:
Basilica di San Pietro in Vaticano.
Santa Maria del Fiore (Cathedral : Florence, Italy)
Harvard subject headings:
Basilica San Pietro in Vaticano.
Church architecture--Italy.
Domes--Italy.
Santa Maria del Fiore (Cathedral : Florence, Italy)
Princeton subject headings:
Basilica San Pietro in Vaticano.
Church architecture--Italy.
Domes--Italy.
Santa Maria del Fiore (Cathedral : Florence, Italy)