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U. Winblad, Drangert, J. - O., and Bew, J.,
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N. Johnstone,
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C. Brelet-Rueff,
“Helping children in the humid tropics : water education”, vol. no. 11. UNESCO International Hydrological Programme, UNESCO-IHP, Paris, France, p. 64 p. : ill., photogr., 1997.
L. Abrams,
Rapport portant sur le bilan du secteur Afrique. Geneva, Switzerland: Water Supply and Sanitation Collaborative Council, WSSCC, 1997, p. 40 p.
C. Yniguez and McIntosh, A. C.,
Second water utilities data book : Asia and Pacific region, 2nd ed.nd ed. Manila, Philippines: Asian Development Bank, 1997, p. xix, 210 p. : 43 fig., 14 tab.
J. Richter, Wolff, P., Franzen, H., and Heim, F.,
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P. Fraenkel,
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