Columbia subject headings:
Civilization, Medieval--Congresses.
Communication and culture--Europe--History--To 1500--Congresses.
Communication--Social aspects--Europe--History--To 1500--Congresses.
Harvard subject headings:
Civilization, Medieval--Congresses
Communication and culture--Europe--History--To 1500--Congresses.
Communication--History--To 1500--Congresses.
Communication--Social aspects--Europe--History--To 1500--Congresses.
Middle Ages--Congresses
Visual communication--History--To 1500--Congresses.
Princeton subject headings:
Civilization, Medieval--Congresses.
Communication and culture--Europe--History--To 1500--Congresses.
Communication--Social aspects--Europe--History--To 1500--Congresses.