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| 035 | _a90616 | ||
| 090 | _aTesis | ||
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_aChapingo, Méx. : _bEl autor, _c199 |
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| 502 | _aTesis ( | ||
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_aALEPH _b10 _c20130110 _lUCH01 _h1430 |
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_aCONVERSION _b10 _c20130109 _lUCH01 _h1344 |
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