S. Africa. De ZA,
“Learning and sharing for sustainable water supply and sanitation : synopsis of conference on appropriate technologies for sustainable water supply and sanitation services, Gauteng, South Africa, 21-23 November 2001”. South Africa, Department of Water Affairs and Forestry, Pretoria, South Africa, p. 31 p. : boxes, photogr., 2002.
S. Africa. De ZA,
“Water for all, for life”. South Africa, Department of Water Affairs and Forestry, Pretoria, South Africa, p. 41 p. : 1 box, photogr., 2 tab., 2002.