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_aMedellín Leal, Fernado Eugenio. _973889 |
| 245 | 0 | _aManagement of natural vegetation in the semi-arid ecosystem of México | |
| 500 | _aSobretiro de : Walker, B. H., ed. Management of semi-arid ecosystems. -- Amsterdam : Elsevier, 1979. pp. 351-375 | ||
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_aBotánica _xRegiones áridas. _914612 |
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_aGanadería _xRegiones áridas. _944841 |
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_aGanadería _zMéxico. _944867 |
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