00309nam a2200109Ia 4500008004100000100001900041245006400060250001400124260003400138650001000172700001700182190829s9999||||xx |||||||||||||| ||und||  aKhanna, D. R.  2aA Textbook of Sound:  With Theory of Oscillations And Waves  a11TH ED.   bAtma Ram & SonsaDelhi c1975  aSound  aBedi, R. S.