000			00243nam a2200133Ia 4500
100			_aUNESCO _97769
250			_a1st Ed.
365			_cRs.
942			_cBK
245			_aChemistry
260			_bUNESCO _c2005
082			_bUNE
999			_c53496 _d53496
041			_aeng
655			_a24G
546			_aText in English
300			_c20 cm.