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_aMaramba, Felix D. _971229 |
| 245 | 1 | 2 | _aA waste-recycling biogas generator for farm self-sufficiency |
| 500 | _aSobretiro de: Spirit of enterprises: the 1987 Rolex awards.- London : Aurum, 1987. pp. 12-14 | ||
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_aBiogas. _912740 |
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