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| 100 | 1 | _aAlvarez Gastélum, Manuel | |
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_aManual de conservación de suelos / _cpor Manuel Alvarez Gastélum. |
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_aMéxico : _b[s.n.], _c1951. |
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_a100 p. : _bil. |
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_aEROSION _921696 |
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_aSUELOS - _xCONSERVACION _99790 |
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_c36307 _d36307 |
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