1. Williams, M. A. J., and Adamson, D. A., Geogr. J., 139, 498–508 (1973).
2. Mukherjee, R., Rao, C., and Trevor, J. C., The Ancient Inhabitants of Jebel Moya, Sudan (Cambridge Univ. Press, 1955).
3. Addison, F., Wellcome excavations in the Sudan: I, Jebel Moya, 1910–1914 (Oxford Univ., Press 1949).
4. Harlan, J. R., and de Wet, J. M. J., Crop Sci., 12, 172–176 (1972).
5. Williams, M. A. J., and Adamson, D. A., Nature, 284, 584–586 (1974).