Columbia subject headings:
Social classes--Germany--History--To 1500.
Social mobility--Germany--History--To 1500.
Harvard subject headings:
Social classes--Germany--History--To 1500--Congresses.
Social mobility--Germany--History--To 1500--Congresses.
Princeton subject headings:
Social classes--Germany--History--To 1500--Congresses.
Social mobility--Germany--History--To 1500--Congresses.