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020 _a81-219-0467-6
082 _a535
082 _bSUB/A
100 _aN
_bSUBRAHAMANYAN
245 2 _aA TEXTBOOK OF OPTICS
260 _aNEW DELHI
260 _bS.CHAND&COMPANY LTD
260 _c1966
999 _c9820
_d9820