Columbia subject headings:
Harvard subject headings:
Abbasids.
Islamic Empire--History, Naval.
Mediterranean Region--History--476-1517.
Muslims--Mediterranean Region--History--To 1500.
Navigation--Mediterranean Region--History.
Sea-power--Islamic Empire.
Shipping--Mediterranean Region--History.
Princeton subject headings:
Islam--Mediterranean Region--History--To 1500.
Islamic Empire--History, Naval.
Islamic civilization--History.
Mediterranean Region--History, Naval.
Mediterranean Region--History--476-1517.