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_aCongreso Nacional de Extensión Agrícola ( _n1 _d: 1974 _c: Chapingo, Méx.) _926959 |
| 245 | _aPrograma general | ||
| 260 |
_aChapingo, Méx. : _bDirección General de Extensión Agrícola, _c(s.a.) |
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_aExtensión agrícola _xCongresos. _939155 |
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