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020 _a9788466787130
090 _a507
090 _bE13.VOL6
100 _aErechavarria,Carmen
245 0 _aNatural science 1
245 0 _bsecondary education
260 _bAnaya
260 _c2011
597 _aLibro
942 _cLINF
999 _c29564
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040 _aCO-BoFAC
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003 CO-BoFAC