000			00278nam a2200121Ia 4500
100			_aPeriodical
942			_cBK
245			_aProgress of education, Vol 48, Nos 1-12, Aug 1973-July 1974
260			_a- _b- _c1974
082			_a370.5 _bP.F.
300			_a366
546			_aEnglish
999			_c333238 _d333238
041			_aeng