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Slow sand filtration for community water supply in developing countries : a design and construction manual / prep. by J.C. van Dijk and J.H.C.M. Oomen.
- WHO. International reference centre for community water supply (IRC),
- 1978.
- The Hague :
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Analysis of organic compounds in water to support health effect studies : a consultant report / by A.W. Garrison.
- WHO. International reference centre for community water supply (IRC),
- 1978.
- The Hague :