000 00313nam a2200121Ia 4500
008 220421s1991 xx 000 0 und d
041 _aeng
082 _a507
_bDAS/SCI
100 _aDas ,R.C.
_9570033
245 _aScience teaching in schools
250 _a2nd ed
260 _aN delhi
_b Anmol Publications
_c1991
999 _c396134
_d396134