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_aSepúlveda Silva, Sergio. _9104489 |
| 245 | 1 | 4 | _aThe effects of modern technology on labor for producing crops on small in two integrated rural development districts in Colombia |
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_aIthaca, N.Y. : _bNew York State College of Agriculture and Life Sciences, _c1979 |
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_a61 p. _b; gráfs. |
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_aCornell International Agriculture. Mimeograph _v; 68 |
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_aAgricultura _xInnovaciones tecnológicas. _91565 |
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_aAgricultura _xTrabajadores _xColombia. _91851 |
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_aCornell international agriculture mimeograph _v; 68 |
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