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3
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Water harvesting in five African countries / M.D. Lee and J.T. Visscher.
- International water and sanitation centre (IRC),
- 1990.
- The Hague :
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Information management in the water and sanitation sector : lessons learned from field assignments in Africa and Asia / Stephen Parker.
- International water and sanitation centre (IRC),
- 1993.
- The Hague :
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Pre-treatment methods for community water supply : an overview of techniques and present experience / comp. by J.E.M. Smet and J.T. Visscher ; with contrib. from A. Castilla...[et al.].
- International water and sanitation centre (IRC),
- 1989.
- The Hague :