Efron, Alexander,  1897- <br/><br/>
Sound / 
by Alexander Efron 
 - Bombay :  Vakils, Feffer and Simons Private,  1968 
 - vii, 72 p. :  ill. ;  22 cm. 
 - Basic science series .
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label> Rs. 2.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sound
<br/><br/><label>Dewey Class. No.: </label>534