Columbia subject headings:
Abbasids.
Arabs and Islam.
Islamic Empire--History--750-1258.
Islamic Empire--Intellectual life.
Islamic civilization.
Harvard subject headings:
Abbasids.
Arabs and Islam.
Islamic Empire--History--750-1258.
Islamic Empire--Intellectual life.
Islamic civilization
Princeton subject headings:
Abbasids.
Arabs and Islam.
Islamic Empire--History--750-1258.
Islamic Empire--Intellectual life.
Islamic civilization.