S. Babala,
Cost analysis in rural water supply in Mbeya Region, Tanzania, vol. no. 42. Tampere, Finland: Tampere University of Technology, Institute of Water and Environmental Engineeri, 1990, p. 50 p.: fig., tab.
J. Mueller,
«Final report : part II». Lesotho, Ministry of Interior, Chieftainship Affairs and Rural Development, Village Water Supply, Maseru, Lesotho, p. 32 p., 1990.
IRC International Water and Sanitation Centre, The Hague, NL y DGIS, D. General fo,
«Institutional development in the Indo-Dutch rural water supply and sanitation programme : a discussion paper». Netherlands, Ministry of Foreign Affairs, DGIS, The Hague, The Netherlands, p. 19 p.: tab., 1990.
J. K. Jordan,
Maintenance management. Denver, CO, USA: American Water Works Association, 1990, p. v, 106 p.: fig.
IDRC -Ottawa, Ont., CA, International Development Research Centre y IRC International Water and Sanitation Centre, The Hague, NL,
Pompes a main : questions relatives aux programmes d'approvisionnement en eau des collectivites rurales, vol. no. 25. The Hague, The Netherlands: IRC, 1990, p. xiii, 202 p.: fig., tab., photogr.
I. N. U. N. I. C. E. F. Reg Delhi, Delhi, I. N. World Bank, y IN, I. Rajiv Gand,
«Report on field testing in Coimbatore of the standard India Mark II and open top cylinder India Mark III pumps». World Bank Regional Water and Sanitation Group South Asia, New Delhi, India, p. ca. 130 p.: fig., tab., 1990.