Columbia subject headings:
Art--Italy--Siena.
San Gimignano (Italy)--History.
Siena (Italy)--History.
Harvard subject headings:
Art--Italy--Siena
San Gimignano (Italy)--History.
Siena (Italy)--History.
Princeton subject headings:
Art--Italy--Siena.
San Gimignano (Italy)--History.
Siena (Italy)--History.