000 00299nam a2200097Ia 4500
008 120224s9999 xx 000 0 und d
082 _a372.35044
_bTHE
100 _aThier, Herbert D.
245 _aTheaching elementary school science: a laboratory approach.
260 _bSterling
_aNew Delhi
_c1973
999 _c139635
_d139635