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Found 2 results
Filters: Keyword is slow sand filtration and Author is Oxfam -Oxford, GB  [Clear All Filters]
2000
G. B. Oxfam - Oxford, «Oxfam water supply scheme for emergencies : water filtration pack». Oxfam, Oxford, UK, p. 26 p. : fig., tabs., 2000.
1986
G. B. Oxfam - Oxford, «Oxfam water supply scheme for emergencies : water filtration pack». Oxfam, Oxford, UK, p. 22 p.: fig., photogr., 1986.
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