Efron, Alexander <br/><br/>
Sound 

 - Bombay  Vakils, Feffer & Simons Private Ltd.  1957 
 - 72 
<br/><br/><label>Publisher. No.: </label> Popular Book Depot 
<br/><br/><label>Subjects--Personal Names: </label> Physics 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physics