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_aLB1028 _bC6.6 1981 |
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_aCongreso Nacional de Investigación Educativa _n1o _d1981 _cMéxico |
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_aEDUCACION - _vCONGRESOS _96108 |
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_aEducación _xInvestigación _94070 |
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| 905 | _aLibro | ||
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