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_aHaith, Douglas A. _eed. _952261 |
| 245 | _aEffectiveness of soil and water conservation practices for pollution control | ||
| 260 |
_aAthens, Ga. : _bEnvironmental Protection Agency, _c1979 |
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| 300 | _a474 p. | ||
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_aAgricultura _xModelos matematicos. _91744 |
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_aAgua _xConservacion. _92319 |
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_aAgua _xContaminación. _92351 |
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_aSuelos _xConservación. _9110283 |
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_aSuelos _xContaminación. _9110327 |
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_aLoehr, Raymond C. _eed. _967432 |
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