000 00285nam a2200121Ia 4500
005 20250516211813.0
008 250516s9999 xx 000 0 und d
041 _aeng
100 _aSingh, Uttamkumar
245 _aTeaching Of Science
260 _bCommenwealth
_c1997
300 _a256 p.
999 _c74477
_d74477