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100 1 _aSanchez,Isabel, Isabel
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245 1 0 _aCiencias de la naturaleza 1
260 _aMadrid :
_b Mc Graw-Hill,
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650 4 _aC.NATURALES
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700 1 _aLeal, Antonio
_91452
942 _cBK
999 _c1548
_d1548