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_aCongreso Nacional sobre Manejo y Conservación del Suelo y Agua ( _d1993 _c: Montecillo, Méx.) _927138 |
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_aMontecillo, Méx. : _bEl Colegio, _c1993 |
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_aAgua _xConservación _xCongresos. _92323 |
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_aRecursos naturales _xConservación _xCongresos. _995232 |
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_aSuelos _xConservación _xCongresos. _9110292 |
| 710 | 0 |
_aColegio de Postgraduados. Chapingo, Méx. _925068 |
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