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_aBiosphere 2 agriculture : _btest bed for intensive, sustainable, non-polluting farming systems |
| 500 | _aSobretiro de: Outlock on agriculture 22 (3) 1993 pp.167-174 | ||
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_aPoynter, Jane. _991192 |
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_aSilverstone, Sally. _9106099 |
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| 905 | _aMayto Villalobos S. | ||
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