000 00240nam a2200109Ia 4500
008 240421s9999 xx 000 0 und d
100 _aChopra, R.K.
245 0 _aKala Vigyan
260 _aNCERT
_bNCERT
_c1993
300 _a82p.
942 _cBK
999 _c14069
_d14069