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Wollschied
Wollschied
, 1990.
Handpump corrosion in deep bore-holes
. , pp.p. 1-3: tab.
Fecha publicación: 30/12/2004
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Wollschied
, 1990.
Why handpumps break down
. , pp.p. 4-6: fig.
Fecha publicación: 30/12/2004
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