000			00281nam a2200121Ia 4500
020			_a92-3-101058-1
942			_cBK
654			_a
245			_aNew unesco source book for science teaching
260			_aParis _bThe Unesco Press _c1973
082			_a375.5
300			_bHb _c27.7 _a270
999			_c414673 _d414673
041			_aeng