000 00308nam a2200133Ia 4500
005 20260205053753.0
008 260111s9999||||xx |||||||||||||| ||und||
082 _a507 R197T
100 _aRavikumar, S K
245 0 _aTeaching of science
260 _aDelhi
_bTime
_c2002
300 _a144p.
942 _cBK
999 _c127159
_d127159