Columbia subject headings:
Germany--History--Henry IV, 1056-1106.
Germany--History--Henry V, 1106-1125.
Holy Roman Empire--History--Henry IV, 1056-1106.
Holy Roman Empire--History--Henry V, 1106-1125.
Harvard subject headings:
Germany--History--Henry IV, 1056-1106.
Germany--History--Henry V, 1106-1125.
Holy Roman Empire--History--Henry IV, 1056-1106
Holy Roman Empire--History--Henry IV, 1056-1106.
Holy Roman Empire--History--Henry V, 1106-1125.
Princeton subject headings: