000 00297nam a2200121Ia 4500
008 250224s9999 xx 000 0 und d
020 _a435686135
082 _a535NEL
100 _aNelkon M.
245 0 _aOptics, Sound and Waves
260 _bHeinemann Educational Books
_c1973
942 _cBK
999 _c437114
_d437114