Columbia subject headings:
Harvard subject headings:
Church architecture--Italy--Siena (Province)
Siena (Italy : Province)--Buildings, structures, etc.
Symbolism in architecture--Italy--Siena (Province)
Princeton subject headings:
Church architecture--Italy--Siena (Province).
Siena (Italy : Province)--Buildings, structures, etc.
Symbolism in architecture--Italy--Siena (Province).