1991
B. van Hemert, Haemhouts, J., O. Galiz, A., y O. Orozco, S.,
«La bomba de mecate : el desafio de la tecnologia popular». Nicaragua, Direccion de Acueductos Rurales, Juigalpa, Nicaragua, p. 213 p.: 52 fig., 26 tab., photogr., 1991.
H. Beckmann y Gardien, N.,
«L'eau c'est la vie : hydraulique villageoise en zone de foret». Herbert Beckmann, Kleinheubach/Main, Germany, p. 91 p.: photogr., tech. drwngs, 1991.
B. A. Janonis, Logsdon, G. S., Collins, M. R., Barrett, J. M., Bryck, J. M. G., y Hendricks, D.,
Manual of design for slow sand filtration. Denver, CO, USA: American Water Works Association, 1991, p. xxxv, 247 p.: fig., tab.
L. Ministry o LS,
«Manual of standardisation planning, design and construction of village water supplies». Lesotho, Ministry of Interior, Chieftainship Affairs and Rural Development, Village Water Supply, Maseru, Lesotho, p. 75 p. : fig., maps, tech. drwngs., 1991.
M. H. A. Wegelin-Schuringa,
«On-site sanitation : building on local practice», vol. no. 16-E. IRC, The Hague, The Netherlands, p. 74 p.: fig., tab., 1991.
J. M. Erskine,
«Rain water harvesting systems in Southern Africa», in
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J. E. Gould,
Rainwater catchment systems for household water supply, vol. no. 32. Bangkok, Thailand: Environmental Sanitation Information Center, ENSIC, 1991, p. iii, 57 p.: 12 fig., 14 photogr., 4 tab.
L. Bo y Liu, J.,
«Rainwater harvesting systems for drinking water supply in China», in
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K. M. A. Aziz, Hasan, K. Z., Patwary, M. Y., y Hoque, B. A.,
«Rural women in sanitation programmes», in
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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.
F. Solsona,
«Water tanks with HFB technique», in
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J. Mate,
«Why a pit latrine : a manual for extension workers and latrine builders», vol. no. 8. Piped Supplies for Small Communities (PSSC) Project Zambia, S.l., p. ii, 22 p.: fig., 1991.