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2
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Training community motivators in water supply and sanitation : a reference document / Alastair White and Gill Gordon.
- International reference centre for community water supply and sanitation,
- 1987.
- The Hague :
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Slow sand filtration for community water supply : planning, design, construction, operation and maintenance / J.T. Visscher ... [et al.].
- International reference centre for community water supply and sanitation,
- 1987.
- The Hague :