Columbia subject headings:
Chapels--Italy--Siena.
Oratories--Italy--Siena.
Siena (Italy)--Buildings, structures, etc.
Harvard subject headings:
Art, Italian--Italy--Siena.
Christian art and symbolism--Italy--Siena.
Oratories--Italy--Siena.
Princeton subject headings:
Church architecture--Italy--Siena.
Church buildings--Italy--Siena.
Church decoration and ornament--Italy--Siena.
Siena (Italy)--Buildings, structures, etc.