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| 260 | _aMéxico | ||
| 300 | _a13-22 | ||
| 362 | 0 | _a2009 Año 18, no. 99, mar.-abr. | |
| 653 | 0 | _aEDUCACION CIENTIFICA | |
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| 653 | 0 | _aCOMPETENCIA CIENTIFICA | |
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