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| 100 | 1 | _aPurata Velarde, Silvia E. | |
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_aEcología / _cSilvia E. Purata Velarde, Isabel García Coll. |
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_aMéxico : _bSantillana, _c1999 |
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| 300 |
_a224 p. _b:il. |
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_aECOLOGIA _xESTUDIO Y ENSEÑANZA |
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_aGarcía Coll, Isabel, _ecoaut. |
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| 830 | 0 | _aBachillerato | |
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_c76491 _d76491 |
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