Columbia subject headings:
Duomo di Siena.
Pavements, Mosaic--Italy--Siena.
Harvard subject headings:
Duomo di Siena.
Mosaics, Medieval--Italy--Siena.
Pavements, Mosaic--Italy--Siena.
Princeton subject headings:
Duomo di Siena.
Pavements, Mosaic--Italy--Siena.