000 00249nam a2200109Ia 4500
008 240421s9999 xx 000 0 und d
100 _aDas, Bhagwan
245 0 _aVigyan Shikshan
260 _aNew Delhi
_bOmega
_c2007
300 _a192p.
942 _cBK
999 _c12986
_d12986