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| 260 | _aBogotá, Colombia | ||
| 300 | _a70-81 | ||
| 362 | 0 | _a2007 No. 74, mar. | |
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| 653 | 0 | _aENSEÑANZA | |
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| 653 | 0 | _aEDUCACION SECUNDARIA | |
| 902 | _aArticulo | ||
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