R. K. Sivanappan,
Land and water resources and rural development in India : situation and prospects, vol. no. 16. Linkoping, Sweden: Linkoping University, Department of Water and Environmental Studies, 1991, p. 36 p. : 15 tab.
F. R. France. Mi Paris y Toulouse, F. R. Agence de,
Les elus locaux et l'assainissement, vol. no. 1. Paris, France: France, Ministere de l'Environnement, 1991, p. 48 p.: fig., photogr., tab.
M. Bapat, Crook, N., y Clarkson, D.,
«Letters : [David Clarkson's reaction to "Behind the technical approach to slum improvement", Waterlines, vol. 8, no. 1, July 1989, and authors' reply]»,
Waterlines, an international journal of water, sanitation and waste, pp. p. 31-32: photogr., 1991.
M. W. Blokland, Boot, M. T., y van der Wildt, C. D.,
«Rada Water Supply and Sanitation Project Republic of Yemen : report of the fourth monitoring mission, 9-15 June 1991». Netherlands, Ministry of Foreign Affairs, DGIS, The Hague, The Netherlands, p. vii, 34 p., 1991.
R. Franceys y Cotton, A.,
Services for shelter : infrastructure for urban low-income housing, vol. no. 3. Liverpool, UK: Liverpool University Press, 1991, p. vii, 147 p.: fig., photogr.
E. O. Mairura y Nyangeri, G. E.,
«Site conditions in infrastructure development», in
Infrastructure for low-income communities : proceedings of the 16th WEDC conference : Regional Centre for Urban and Environmental Studies (RCUES), Osmania University, Hyderabad, India, 27-31 August, 1990, 1991, pp. P. 59-62: 3 fig.
E. A. R. Ouano y Cairncross, S.,
Surface water drainage for low-income communities. Geneva, Switzerland: World Health Organization (WHO), 1991, p. v, 88 p.: fig., photogr., tab.