Modelstudy Gash Basin. Appendix E (1989) Water resources assessment and development project in the Sudan (WADS); Institute of Applied Geoscience; TNO; National Corporation for the Development of Rural Water Resources; NCDWR
Manuals for extension workers. Appendix H (1989) Water resources assessment and development project in the Sudan (WADS); Institute of Applied Geoscience; TNO; National Corporation for the Development of Rural Water Resources; NCDWR