Columbia subject headings:
Africa, North--Economic conditions.
Africa, North--History--647-1517.
Africa, North--Social conditions--History.
Harvard subject headings:
Africa, North--Economic conditions--History.
Africa, North--History--647-1517
Africa, North--social conditions--History.
Princeton subject headings:
Africa, North--Economic conditions--History.
Africa, North--History--647-1517.
Africa, North--Social conditions--History.