Columbia subject headings:
Harvard subject headings:
Architecture, Ottonian--Congresses.
Art, Ottonian--Congresses.
Germany--History--Saxon House, 919-1024--Congresses.
Holy Roman Empire--History--Otto I, 936-973--Congresses.
Holy Roman Empire--History--Saxon House, 919-1024--Congresses.
Otto I, Holy Roman Emperor, 912-973--Congresses.
Princeton subject headings:
Architecture, Ottonian--Congresses.
Art, Ottonian--Congresses.
Germany--History--Saxon House, 919-1024--Congresses.
Holy Roman Empire--History--Otto I, 936-973--Congresses.
Holy Roman Empire--History--Saxon House, 919-1024--Congresses.
Otto I, Holy Roman Emperor, 912-973--Congresses.