000 00259nam a2200109Ia 4500
008 240421s9999 xx 000 0 und d
100 _aAggarwal, Yatish
245 0 _aChiktasa Vigyan Ki Khaniya
260 _aNCERT
_bNCERT
_c1997
300 _a80p.
942 _cBK
999 _c14040
_d14040