Columbia subject headings:
Abbasids.
Islamic Empire--History--750-1258.
Harvard subject headings:
Abbasids--History.
Islamic Empire--History--1258-1517.
Islamic Empire--History--750-1258.
Islamic Empire--Social life and customs.
Princeton subject headings:
Abbasids--History.
Islamic Empire--History--1258-1517.
Islamic Empire--History--750-1258.
Islamic Empire--Social life and customs.