Columbia subject headings:
Art, Renaissance--Italy--Siena.
Duccio, di Buoninsegna, -1319?
Landscape painting, Renaissance--Italy--Siena.
Lorenzetti, Ambrogio, 1285-approximately 1348.
Martini, Simone, 1283-1344.
Painting, Italian--Italy--Siena.
Harvard subject headings:
Cities and towns, Medieval, in art.
Landscape painting, Italian--Italy--Siena.
Landscape painting, Medieval--Italy--Siena.
Princeton subject headings:
Cities and towns, Medieval, in art.
Landscape painting, Italian--Italy--Siena.
Landscape painting, Medieval--Italy--Siena.