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Filters: Keyword is 3000 well programme (ghana)  [Clear All Filters]
1990
Wollschied, “Handpump corrosion in deep bore-holes”, Low-cost pumping systems, pp. p. 1-3: tab., 1990.
Wollschied, “Why handpumps break down”, Low-cost pumping systems, pp. p. 4-6: fig., 1990.
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