000 00246nam a2200109Ia 4500
008 230401s9999 xx 000 0 eng d
100 _aSUBRAHMANYAM (N) & BRIJ LAL
245 0 _aOPTICS
250 _a2000
260 _bS. CHAND
942 _2ddc
_cBTECH
999 _c3107
_d3107