Columbia subject headings:
Architecture--Italy--History--20th century--Congresses.
Architecture--Italy--History--21st century--Congresses.
Architecture--Italy--History--21st century--Designs and plans--Congresses.
Harvard subject headings:
Architecture--Italy--21st century--Congresses.
Architecture--Italy--21st century--Designs and plans--Congresses.
Architecture--Italy--History--20th century--Congresses
Architecture--Italy--History--20th century--Designs and plans--Congresses.
Princeton subject headings:
Architecture--Italy--History--21st century--Congresses.
Architecture--Italy--History--21st century--Designs and plans--Congresses.