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|a Mosher, Arthur T.
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| 245 |
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|a Manual de instrucción para el estudio en grupo de cómo hacer avanzar la agricultura
|
| 260 |
# |
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|a México :
|b UTEHA,
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|
| 650 |
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| 653 |
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|a Extensión agrícola
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| 929 |
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| 930 |
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|a Gabriela
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