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_aMaramba, Felix D. _971229 |
| 245 | 1 | _aBiogas works for pollution control | |
| 500 | _aSobretiro de: Maramba, Felix D.; Biogas and waste recycling: the philippine experience. Philippine, Liberty Flour Mills, 1978. pp. 165-168 | ||
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_aEstiércol, Gases en. _938331 |
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_aMedio ambiente _xContaminación. _974069 |
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