000 00266nam a2200109Ia 4500
008 240421s9999 xx 000 0 und d
100 _aSingh, Uttam Kumar
245 0 _aTeaching Of Science
260 _aNew Delhi
_bCommonwealth
_c2007
300 _a256p.
942 _cBK
999 _c13198
_d13198