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koha113031 |
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|2 1991
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| 245 |
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|a Educación química /
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| 650 |
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| 690 |
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|a Ciencias de la tierra
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| 710 |
2 |
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|a Universidad Nacional Autónoma de México.
|b Facultad de Química
|9 487707
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|u https://www.revistas.unam.mx/index.php/req
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