000 00259nam a2200109Ia 4500
008 240421s9999 xx 000 0 und d
100 _aRastogi, Sudesh
245 0 _aGraha Vighyan
260 _aMeerut
_bChitra Prakashan
_c2010-
300 _a326p.
942 _cBK
999 _c14869
_d14869