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_9115671 _aSANCHEZ, P.A. |
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_9127179 _aVALVERDE, C. |
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| 260 | _c1977 | ||
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_tTropical Agriculture (Trinidad) _d1977 _gv.54(4) p.307-321 |
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| 245 | 1 | 0 | _aEffects of land clearing methods on soil properties of an ultisol and crop performance in the amazon jungle of Peru |
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