Columbia subject headings:
Harvard subject headings:
Conflict management--Political aspects--Germany, Northern--History--To 1500.
Germans--Germany, Northern--Communication--History--To 1500.
Germany, Northern--Social conditions--To 1500.
Holy Roman Empire--History--To 1517.
Holy Roman Empire--Social conditions--To 1500.
Princeton subject headings:
Germany--Social conditions--To 1500.
Holy Roman Empire--History--1273-1517.
Holy Roman Empire--Social conditions--To 1500.