Columbia subject headings:
Harvard subject headings:
Arab countries--History.
Civilization, Arab
Islam--History
Islamic Empire--History.
Islamic Empire--Kings and rulers--Biography.
Islamic civilization
Princeton subject headings:
Arab countries--History.
Civilization, Arab.
Islam--History.
Islamic Empire--History--661-750.
Islamic Empire--History--750-1258.
Islamic Empire--History.
Islamic Empire--Kings and rulers--Biography.
Islamic civilization.