Bibliography
• World Health Organization 1996,
http://www.who.int/docstore/water_sanitation_he
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• Agricultural University Wageningen, Netherlands
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World Health Organization
A.1, A.2, A.5, A.7, A.9, A.10, A.11, A.12, A.13, A.14, A.17, A.18, A.19, A.20,
A.21, A.22, A.24, A.25, A.26, A.27. A.28
Dr Steven Lindsay, Durham University, UK A.8