World Bank -Washington, DC, US and UNDP -New York, NY, US,
“All-Africa seminar on low-cost rural and urban-fringe water supply : Abidjan, October 13-18, 1986”. UNDP (United Nations Development Programme), Abidjan, Ivory Coast, p. 28 papers (ca. 450 p.), 1986.
UN-HABITAT -Nairobi, KE, United Nations Human Settlements Programme,
The design of shallow sewer systems. Nairobi, Kenya: UN-Habitat, United Nations Centre for Human Settlements, 1986, p. iii, 87 p.: fig., tab.
P. E. C. E. P. I. S. - Lima,
“Drinking water supply and sanitary disposal of excreta in marginal urban areas : proceedings of the symposium held in Santiago, Chile, 5-9 November 1984”, vol. no. 25. Pan American Center for Sanitary Engineering and Environmental Sciences, Lima, Peru, p. iv, 345 p.: fig., tab., 1986.