Columbia subject headings:
Architecture, Medieval--Italy--Bologna--Exhibitions.
Bologna (Italy)--Buildings, structures, etc.--Exhibitions.
Porticoes--Italy--Bologna--Exhibitions.
Harvard subject headings:
Arcades (Architecture)--Italy--Bologna--Exhibitions.
Architecture and society--Italy--Bologna--Exhibitions.
Architecture, Medieval--Italy--Bologna--Exhibitions.
Bologna (Italy)--Buildings, structures, etc.--Exhibitions.
Princeton subject headings:
Architecture, Italian--Italy--Bologna--Exhibitions.
Architecture, Medieval--Italy--Bologna--Exhibitions.
Bologna (Italy)--Buildings, structures, etc.--Exhibitions.
Porticoes--Italy--Bologna--Exhibitions.