1. F. W. Andrews, and T. W. Clouston, 1937 ). Section of Botany and Plant Pathology. Agricultural Research Service. Rep. Dep. agric. For., Sudan Govt. 1936, PP. 33 -34 .
2. F. W. Andrews, and T. W. Clouston(1938 ). Section of Botany and Plant Pathology . Agricultural Research Service. Rep. Dep. agric. For., Sudan Govt. 1937, pp. 36 -42 .
3. Anon. 1943 . Annual Reports of the Agricultural Research Service, Sudan Government, 1938-9 and 1939-40 (in the Press).
4. W. L. Balls(1919 ). The Cotton Plant in Egypt.
5. A. S. Boughey, 1943 . Report of the Agricultural Research Institute, Sudan Government, 1940 (in the Press).