000 00281nam a2200109Ia 4500
082 _a507
_bTHI
100 _aD.Thier
245 _ateaching elementary school science A laboratory Approach
_cHerbert D.Thier
260 _aAmerica
_bHeath and company
_c1970
300 _a273
942 _cBK
999 _c7349
_d7349