Columbia subject headings:
City planning--Italy--Siena--History.
Siena (Italy)--Description and travel.
Siena (Italy)--History.
Harvard subject headings:
City planning--Italy
City planning--Italy--Siena.
Siena (Italy)--History.
Princeton subject headings:
City planning--Italy.
Siena (Italy)--Description.
Siena (Italy)--History.