Columbia subject headings:
Harvard subject headings:
Christian art and symbolism--Italy--Siena.
Church decoration and ornament--Italy--Siena.
Duomo di Siena.
Facades--Italy--Siena.
Siena (Italy)--Buildings, structures, etc.
Princeton subject headings:
Christian art and symbolism--Italy--Siena.
Decoration and ornament, Architectural--Italy--Siena.
Decoration and ornament, Medieval--Italy--Siena.
Duomo di Siena.
Facades--Italy--Siena.
Siena (Italy)--Buildings, structures, etc.