I. Palmer y Pegram, G. C.,
The applicability of shallow sewer systems in South Africa, vol. no. TT113/99. Pretoria, South Africa: Water Research Commission, WRC, 1999, p. ix, 51 p. : 7 fig., 8 tab., 6 photogr.
T. Ningnoi,
«Arsenic removal from groundwater by conditioned zeolite», vol. no. 081. IHE (International Institute for Infrastructural, Hydraulic and Environmental Engineering), Delft, The Netherlands, p. 54 p. : fig., tab., 1999.
I. N. Socio Econ Trivandrum,
«Experiences of a pilot programme on decentralised water supply systems : Malappuram District, Kerala». Socio-Economic Unit Foundation, Trivandrum, India, p. v, 43 p. fig., ill., maps, tab., 1999.
K. E. World Bank Nairobi y KE, K. Ministry o,
«Gender assessment of Kwale water and sanitation project : Kenya country report». World Bank Regional Water and Sanitation Group for East and Southern Africa, Nairobi, Kenya, p. 41 p. : fig., tab., 1999.
P. Iyer,
«Mechanisms for sustainability in a supply-driven environment»,
Waterlines, an international journal of water, sanitation and waste, pp. p. 25-28 : 1 box, 2 photogr., 2 tab., 1999.
A. Fang,
«On-site sanitation : an international review of World Bank experience». UNDP-World Bank Regional Water and Sanitation Group, New Delhi, India, p. 30 p. : photogr., tab., 1999.
A. F. Caicedo y Granja, V. L. Trujillo,
«Seleccion de tecnologÃa sostenible para la disposición de aguas residuales en la vereda de Juanchaco». Universidad del Valle, Facultad de Ingenieria, Cali, Colombia, p. 188 p. : tab., graphics, map., photos
, 1999.