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_aAnderson, Jack R. _95586 |
| 245 | 0 | _aVariability of cereal yields; sources of change and implications for agricultural research policy | |
| 500 | _aSobretiro de : Food Policy 12 (3) : 199-212, 1987 | ||
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_aCereales _xRendimiento. _921461 |
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_aPolítica agrícola. _990283 |
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_aEvans, Lloyd Thomas. _938948 |
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_aHacell, Peter B. R. _952155 |
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