Columbia subject headings:
Architecture--Italy--Siena--History.
Art and state--Italy--Siena.
Art, Italian--Italy--Siena.
City planning--Italy--Siena--History.
Palazzo pubblico (Siena, Italy)--History.
Piazza del Campo (Siena, Italy)--History.
Public buildings--Italy--Siena--History.
Siena (Italy)--Buildings, structures, etc.
Siena (Italy)--Politics and government.
Harvard subject headings:
Architecture--Italy--Siena--History.
Art and state--Italy--Siena.
Art, Italian--Italy--Siena.
City planning--Italy--Siena--History.
Palazzo pubblico (Siena, Italy)--History.
Piazza del Campo (Siena, Italy)--History.
Public buildings--Italy--Siena--History.
Siena (Italy)--Buildings, structures, etc.
Siena (Italy)--Politics and government.
Princeton subject headings:
Architecture--Italy--Siena--History.
Art and state--Italy--Siena.
Art, Italian--Italy--Siena.
City planning--Italy--Siena--History.
Palazzo pubblico (Siena, Italy)--History.
Piazza del Campo (Siena, Italy)--History.
Public buildings--Italy--Siena--History.
Siena (Italy)--Buildings, structures, etc.
Siena (Italy)--Politics and government.