Columbia subject headings:
Harvard subject headings:
Europe--Emigration and immigration--History--Congresses.
Feudalism--Europe--History--Congresses.
Residential mobility--Europe--History--Congresses.
Princeton subject headings:
Europe--Social conditions--16th century--Congresses.
Europe--Social conditions--To 1492--Congresses.
Migration, Internal--Europe--History--Congresses.
Social history--Medieval, 500-1500--Congresses.
Social mobility--Europe--History--Congresses.