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_aGuzmán García, José Guadalupe. _951950 |
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_aEvaluación del riesgo de degradación en el Ajusco _c/por José Guadalupe Guzmán García |
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_aChapingo, Méx. : _bEl autor, _c1999. |
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_aSuelos _xDegradación. _9110336 |
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_aSuelos _xMéxico (D.F.) _9110443 |
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| 905 | _aPatricia Mendoza P. | ||
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