Columbia subject headings:
Germany--History--Otto I, 936-973.
Germany--Kings and rulers--Biography.
Otto I, Holy Roman Emperor, 912-973.
Harvard subject headings:
Germany--History--Otto I, 936-973.
Germany--Kings and rulers--Biography.
Otto I, Holy Roman Emperor, 912-973.
Princeton subject headings:
Germany--History--Otto I, 936-973.
Germany--Kings and rulers--Biography.
Otto I, Holy Roman Emperor, 912-973.