Biswas, N N <br/><br/>
Principles of Telephony 

 - Bombay  Asia Publishing House  1928 
 - 136p 
<br/><br/> includes index and biblioraphy 
<br/><br/><label>ISBN: </label> 0 
<br/><br/><label>Dewey Class. No.: </label>Q62  / B545