Columbia subject headings:
Harvard subject headings:
Feudalism--Europe--History--Congresses.
Middle Ages--Congresses
Nobility--Europe, Central--History--To 1500--Congresses.
Nobility--Europe, Northern--History--To 1500--Congresses.
Peasants--Europe, Central--History--To 1500--Congresses.
Peasants--Europe, Northern--History--To 1500--Congresses.
Peasants--Europe--History--Congresses.
Princeton subject headings:
Feudalism--Europe--History--Congresses.
Middle Ages--Congresses.
Peasants--Europe--History--Congresses.
Rösener, Werner.