Columbia subject headings:
Harvard subject headings:
Abbasids--Early works to 1800.
Arabic poetry--750-1258--History and criticism.
Islamic Empire--Kings and rulers--Early works to 1800.
Muttaqī lillāh, Caliph, -968.
Rāḍī Billāh, Caliph, 909-940
Princeton subject headings:
Abbasids.
Islamic Empire--History--750-1258.