(3eYGde JGQjN ShOGf hGOi Gdfjd(B: (3ef GdbQf GdYGTQ Gdi GdbQf GdJGSY YTQ GdejdGOi(B) AN OUTLINE HISTOTY OF THE NILE VALLEY SUDANs ([S.N] : (3ecJHI GdYQH , s, 1967)