000			00314nam a2200133 4500
082			_a370 _bJOU.U
084			_2Colon Classification
245			_aJournal of research in science teaching /
260			_c1971.
500			_aVol 7.1 Vol 9
505			_aVol 7.1 Vol 9
650			_aPeriodical
942			_cBK _2ddc
999			_c684574 _d684574