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2
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Community sanitation improvement and latrine construction program : a training guide / prep. by John Gavin, Trevor Hockley, Steve Joyce.
- Water and sanitation for health,
- 1993.
- Arlington, VA :
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A.I.D. assistance to Panama : evaluation of the post-1989 program / by Jacques Polak, Anne Krueger, John Newton.
- US. AID,
- 1993.
- Arlington, VA :