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_aMadrigal Mexía, Concepción _929655 |
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_aCiencias 6 : _beducación primaria / _cConcepción Madrigal Mexia, Gabriel Hernández Valverde, Irma Yolanda Bernal Mariscal |
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_aMéxico : _bSantillana, _c1994. |
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_aBernal Mariscal, Irma Yolanda, _ecoaut. |
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