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_aQ 127 _bH5 |
| 245 | 1 | 0 | _aHistoria de la ciencia y la tecnología |
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_aMéxico : _bEl Colegio de México, _c1991 |
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_a292 p. ; _c21 cm. |
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_aLecturas de Historia mexicana ; _v1 |
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_aCiencia - _xHistoria - _xMéxico |
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| 650 | 4 |
_aTecnología - _xHistoria - _xMéxico |
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| 700 | 1 | _aTrabulse, Elías, selecc. | |
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