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_a330.972 _bV176a _222a ed. |
| 100 | 1 | _aValladares Arjona, Rubén. | |
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_aAgricultura en México _b: diversidad o crisis _c/ Rubén Valladares Arjona. |
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_aMéxico : _bUniversidad Autónoma Chapingo, _c2002. |
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