Columbia subject headings:
Architecture--Italy--Siena--History--Designs and plans--Exhibitions.
Architecture--Italy--Siena--History--Exhibitions.
Biblioteca comunale di Siena--Exhibitions.
Harvard subject headings:
Architectural drawing--Italy--Siena--Exhibitions.
Architectural drawing--Italy--Siena--History--Exhibitions.
Architecture--Italy--Siena--Exhibitions.
Architecture--Italy--Siena--History--Exhibitions.
Biblioteca comunale di Siena--Exhibitions.
Princeton subject headings:
Architectural drawing--Italy--Siena--Exhibitions.
Architecture--Italy--Siena--Exhibitions.
Biblioteca comunale di Siena--Exhibitions.