Columbia subject headings:
Harvard subject headings:
Bishops--Germany--Catalogs.
Church and state--Germany--History
Church and state--Holy Roman Empire--History.
Germany--Church history--843-1517
Holy Roman Empire--Church history.
Holy Roman Empire--History--Otto I, 936-973.
Holy Roman Empire--History--Otto II, 973-983.
Princeton subject headings:
Bishops--Germany--Catalogs.
Catalogs.
Church and state--Germany--History--10th century.
Church and state--Holy Roman Empire--History.
Germany--Church history--10th century.
Holy Roman Empire--Church history.
Holy Roman Empire--History--Otto I, 936-973.
Holy Roman Empire--History--Otto II, 973-983.