000 00269nam a2200121Ia 4500
100 _aUNESCO
942 _cBK
654 _a
245 _aUnesco source book for science teaching
260 _aUnesco
_bUnited Nations
_c1963
082 _a375.5
300 _bHb
_c23.5
_a252
999 _c359163
_d359163
041 _aeng