Columbia subject headings:
Germany--History--843-1273.
Holy Roman Empire--History--843-1273.
Harvard subject headings:
Germany--History--843-1273.
Holy Roman Empire--History--843-1273.
Princeton subject headings:
Germany--History--843-1273.
Germany--History--Saxon House, 919-1024.
Holy Roman Empire--History--843-1273.
Holy Roman Empire--History--Saxon House, 919-1024.