000 00279nam a2200121Ia 4500
020 _a8170416329
041 _aeng
082 _a507
_bJOS/TEA
100 _aYadav, M. S.
_91136073
245 _aTeaching of Science
260 _aNew Delhi
_b Anmol Publication
_c1992
942 _cBB
999 _c400766
_d400766