The purification of water on a small scale
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World Health Organization & WHO International Reference Centre for Community Water Supply. (1973). The purification of water on a small scale. The Hague : W. H. O. http://www.who.int/iris/handle/10665/63308
Technical paper ; no. 3
Description19 p. (ill., graphs).
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Workshop on Household Water Treatment and Safe Storage (HWTS), Siem Reap, Cambodia, 10-12 October 2006 : report World Health Organization. Regional Office for the Western Pacific ((WP)EHE/ICP/PHE/2.1/001, 2006)