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_a631.455 _bS6 |
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_aSoil Conservation Society of America. Ankeny, Iowa _9108297 |
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_aSoil erosion, prediction and control _b: proceedings of a national conference... |
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| 260 |
_aAnkeny, Iowa : _bThe society, _c1977 |
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| 300 |
_a393 p. _b;gráfs. |
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_aSpecial publication _v; 21 |
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_aBATCH-UPD _b10 _c20130110 _lUCH01 _h1729 |
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_aBATCH-UPD _b10 _c20130410 _lUCH01 _h1111 |
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_aCONVERSION _b10 _c20130109 _lUCH01 _h1331 |
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| 650 | 1 | 4 |
_aErosión _xPrevención y control. _937337 |
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_aSpecial publication _v; 21 _9109152 |
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