000 00261nam a2200097Ia 4500
008 210324s1969 xx 000 0 und d
041 _aeng
100 _aSubrahmanyam, N.
_91579393
245 _aOptics a text book of
260 _aN. Delhi
_bNiraj, Prakashan
_c1969
999 _c1027995
_d1027995