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_aSDCL _cSDCL _beng |
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_aEvenson R E Ed. _9478875 |
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_aCrop variety improvement and its effect on productivity _b The impacat of international agricutural research. |
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_aWallingford _bCABI Publishing _c2003 |
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_a Gollin D Ed. _9478876 |
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_c791287 _d791287 |
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