National Water and Sanitation Authority -Sana'a

Sana'a, N.Water and & Delft, N.L.T.N.O.-D.G.V.In, 1992. Sources for Sana'a Water Supply (SAWAS - Project) : progress report 92-3 (no. 12) : report period July - September 1992, Sana'a, Yemen: National Water and Sanitation Authority. Available at: https://fr.ircwash.org/sites/default/files/823-YESA92-10726.pdf.