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_aLB1028 _bC6.4 1981 |
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| 111 | 2 |
_aCongreso Nacional de Investigación Educativa _n(1o : _d1981 : _cMéxico) |
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| 245 | 1 | 0 | _aDocumentos base 1981. |
| 260 |
_aMéxico : _bIPN, _c1981. |
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| 300 | _a2 v. | ||
| 650 | 4 |
_aEducación _xInvestigación _zMéxico _99022 |
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| 650 | 4 |
_aEducación _zMéxico _95405 |
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_c16563 _d16563 |
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