Columbia subject headings:
Harvard subject headings:
Cities and towns, Medieval--Europe--Congresses.
Cities and towns--Europe--History--Congresses
Cities and towns--Italy--History--Congresses.
City and town life--Italy--History--Congresses.
Italy--Civilization--Congresses
Italy--Commerce--Regions--History--Congresses.
Italy--History, Local--Congresses.
Princeton subject headings:
Commerce--History--Medieval, 500-1500.
Italy--Civilization--Influence.