000 00285nam a2200109Ia 4500
008 220421s1993 xx 000 0 und d
041 _aeng
082 _a507
_bYAD/TEA
100 _aYadav ,M.S.
_9571443
245 _aTeaching of Science
260 _aNew Delhi
_b Anmol Publications
_c1993
999 _c397671
_d397671