Columbia subject headings:
Harvard subject headings:
Europe--Emigration and immigration.
Europe--History--476-1492.
Princeton subject headings:
Artisans--Europe--History--Congresses.
Christian pilgrims and pilgrimages--Europe--History--Congresses.
Civilization, Medieval--Congresses.
Europe--Emigration and immigration--Congresses.
Europe--Social conditions--To 1492--Congresses.
Student mobility--Europe--Congresses.