000 00283nam a2200109Ia 4500
008 220510s1975 xx 000 0 und d
041 _aeng
082 _a507
_bSHA
100 _aSharma,R.C,
_9776953
245 _aModern Science Teaching
260 _aDelhi:
_bDhanpat Rai and sons,
_c1975
999 _c527161
_d527161