IRC International Water and Sanitation Centre, The Hague, NL et UNICEF -New York, NY, US,
« Evaluer les projets d'approvisionnement en eau et d'assainissement : cours de formation », vol. no. 2. IRC, The Hague, The Netherlands, p. 2 vol. (90, 103 p.), 1989.
« IRC International Water and Sanitation Centre Annual Report 1988 ». IRC, The Hague, The Netherlands, p. 77 p. : fig., maps, photogr., 1989.
C. O. Universida Cali et IRC International Water and Sanitation Centre, The Hague, NL,
« Proyecto integrado de investigacion y demostracion de metodos de pretratamiento para sistemas de abastecimiento de agua : reporte de progreso, febrero de 1989 ». Universidad del Valle, Facultad de Ingenieria, Cali, Colombia, p. 11 p. + 15 p. annexes: 8 photogr., 3 tab., 4 techn.drwgs, 1989.
IRC International Water and Sanitation Centre, The Hague, NL et ZM, Z. Department,
« Report on the short course on preparation and production of guidelines and other communication materials, held in Lusaka 25-28 July 1989 ». Zambia, Department of Water Affairs, Lusaka, Zambia, p. 36 p.: photogr., 1989.
IRC International Water and Sanitation Centre, The Hague, NL et National Environmental Engineering Research Institute -Nagpur, IN, NEERI,
« Slow sand filtration : phase IV final report ». National Environmental Engineering Research Institute, NEERI, Nagpur, India, p. 118 p.: fig., tab., 1989.
M. Ministry o MW et IRC International Water and Sanitation Centre, The Hague, NL,
« Workshop on cost recovery and resources coverage for water supply sustainability and extended low cost sanitation coverage, Liwonde, Machinga district, Malawi, 20-26 August 1989 : workshop report ». Malawi, Ministry of Works, Water Department, Lilongwe, Malawi, p. ii, 45 p.: photogr., tab., 1989.