000 00245nam a2200097Ia 4500
008 190719s9999 xx 000 0 und d
100 _aRaj Bahadur Singh
245 0 _aVishwa ke mahaan vaigyanik
260 _aDelhi
_bRajpal & Sons
_c1969
942 _cBK
999 _c1091
_d1091