Columbia subject headings:
Harvard subject headings:
Art, Italian--Italy--Bologna--Congresses.
Art, Italian--Italy--Bologna--Influence--Congresses.
Bologna (Italy)--Civilization--Influence--Congresses.
Princeton subject headings:
Art, Italian--Italy--Bologna--Congresses.
Bologna (Italy)--Civilization--Influence--Congresses.
Bologna (Italy)--History--Congresses.