Sharma; L.P & Saxena;H.C. <br/><br/>
Text book of sound  English 

 - 2nd rev.ed. 
 - New Delhi  S. Chand  1976 
 - 303pg 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Physics
<br/><br/><label>Dewey Class. No.: </label>534 S23T