K. E. Groundwate Nairobi,
«Inventory of well siting methods : final report», vol. vol. 1. Groundwater Survey (Kenya), Nairobi, Kenya, p. 61 p. + 34 p. ann.: fig., tab., 1989.
Cowater International -Ottawa, Ont., CA, Lahore, P. K. N. E. S. P. A. K. -, y Wardrop-Acres -Winnipeg, Man, CA,
«Project preparation document for World Bank appraisal mission». Wardrop-Acres, Winnipeg, Man, Canada, p. ii, 60 p.: tab., 1989.
W. Zeng-sui, Shepard, D. S., Yun-cheng, Z., Cash, R. A., Ren-jie, Z., Zhen-xing, Z., y Fu-min, S.,
«Reduction of enteric infectious disease in rural China by providing deep-well tap water»,
Bulletin of the World Health Organization, pp. p. 171-180: tab., 1989.
H. J. McPherson, Livingstone, A., Mohamed, Y. A., y Liao, M.,
«Sustainable operation and maintenance of rural water supplies in the Sudan». World Health Organization, Community Water Supply & Sanitation Unit, Geneva, Switzerland, p. iv, 221 p.: fig., tab, 1989.
J. van Meel y Smulders, P.,
Wind pumping : a handbook, vol. no. 101. Washington, DC, USA: World Bank, 1989, p. xx, 273 p.: fig., photogr., tab.