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Heber, G.
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1985
G. Heber
,
Simple methods for the treatment of drinking water
. Braunschweig, Germany: Vieweg, 1985, p. 78 p.: 36 fig., 13 tab.
1978
G. Heber
,
«
Water pumping systems using renewable energies
»
. Deutsche Gesellschaft fur Technische Zusammenarbeit (GTZ), Eschborn, Germany, p. iv, 96 p. : fig., 1978.
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