Columbia subject headings:
Civilization, Medieval--Congresses.
Cultural relations--Europe--History--To 1500--Congresses.
Europe--Commerce--History--To 1500.
Europe--History--476-1492--Congresses.
Exchange--Europe--History--To 1500--Congresses.
Harvard subject headings:
Commerce--History--Medieval, 500-1500--Congresses.
Europe--History--476-1492--Congresses.
Voyages and travels--History--To 1500--Congresses.
Princeton subject headings:
Commerce--History--Medieval, 500-1500--Congresses.
Europe--History--476-1492--Congresses.
Voyages and travels--History--To 1500--Congresses.