Hydrogeological data of North-East Kano State (1974) Kano Sate, Tiga, Water Resources and Engineering Construction Agency; WRECA Water Resources and Engineering Construction Agency; Szentes, G.
Hydrogeological databank. Appendix C (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; NCDRWR
Technical committee Nyala-Geneina. Appendix O (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