Columbia subject headings:
Painting, Gothic--Italy--Siena.
Painting, Italian--Italy--Siena--13th century.
Painting, Italian--Italy--Siena--14th century.
Harvard subject headings:
Painting, Italian--Italy--Siena--12th century.
Painting, Italian--Italy--Siena--13th century.
Painting, Italian--Italy--Siena--14th century.
Princeton subject headings:
Painting, Italian--Italy--Siena--12th century.
Painting, Italian--Italy--Siena--13th century.
Painting, Italian--Italy--Siena--14th century.