000 00400nam a2200169Ia 4500
008 180424s9999 xx 000 0 und d
020 _a198518307
084 _a535 W3
100 _a"Walford, W T"
245 0 _aOptics
250 _a\\197600ENGGPS000
260 _aOxford University Press
260 _b1976
260 _cNew Delhi
500 _aincludes index and biblioraphy
942 _cBK
999 _c34893
_d34893