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_aGustafson, Axel Ferdinand. _951577 |
| 245 | _aConservation of the soil | ||
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_aNew York : _bMcGraw-Hill, _c1937 |
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_a312 p. _b: ilus |
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_aBATCH-UPD _b10 _c20130110 _lUCH01 _h2005 |
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_aErosión. _937335 |
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_aSuelos _xConservación. _9110283 |
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