Columbia subject headings:
Germany--History--To 1517.
Holy Roman Empire--History--To 1517.
Investiture.
Harvard subject headings:
Germany--History--To 1517.
Holy Roman Empire--History--To 1517.
Investiture--Early works to 1800.
Investiture.
Princeton subject headings:
Germany--History--To 1517.
Holy Roman Empire--History--To 1517.
Investiture.