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2
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Planning water and sanitation systems for small communities / by David Donaldson.
- WHO. International reference centre for community supply (IRC),
- 1976.
- The Hague :
-
European cooperation in professional and postgraduate courses : a cooperative effort in offering training to other parts of the world : report of a conference, September 6-8, 1989, Nuffic, The Hague / Julia M. Ekong-Ballot.
- Nuffic [etc.],
- 1989.
- The Hague :