IRC International Water and Sanitation Centre, The Hague, NL y 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 y 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 y 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 y 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 y 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.