000 00257nam a2200109Ia 4500
008 230421s9999 xx 000 0 eng d
100 _aH.S. Sharma & Other
245 0 _aVigyan Shikshan
250 _aRevised
260 _bRadha Prakashan
942 _2ddc
_cBED
999 _c21981
_d21981