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_aLB1028 _bC6.4 1981 |
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_aCongreso Nacional de Investigación Educativa _n(1o : _d1981 : _cMéxico) |
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| 245 | 1 | 0 | _aDocumentos base 1981. |
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_aMéxico : _bIPN, _c1981. |
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_aEducación _xInvestigación _zMéxico _99022 |
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_aEducación _zMéxico _95405 |
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