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_aBarrera Islas, Daniel. _910394 |
| 245 | 1 | 3 | _aLa investigación en economía agrícola en el Colegio de Postgraduados |
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_aChapingo, Méx. : _bENA. Colegio de Postgraduados. Centro de Economía Agrícola, _c1976 |
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_aAgricultura _xAspectos economicos _zMexico. _91312 |
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