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| 100 | _aFOOD and Agriculture Organization | ||
| 245 | _aBiogas: what it is, how it is made, how to use it | ||
| 260 |
_aRome _bFood and Agriculture Organization of the United Nations _c1984 |
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| 300 | _a47p. | ||
| 440 | _aFAO Economic and Social Development Series No.;3/31 | ||
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