000 00359nam a2200145Ia 4500
008 180710s9999 xx 000 0 und d
020 _a139466
082 _a534
_bOPE
100 _aOPEN University of Sri Lanka
245 _aPhysics: sound
260 _aNugegoda
_bThe Open University of Sri Lanka
_c1986
300 _a64 p.
650 _aSound
942 _cR
999 _c74451
_d74451