Biswas, Nripendra N <br/><br/>
Principles of telephony 

 - 1st ed. 
 -  M P P  1964 
 - xi+185 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telephony
<br/><br/><label>Dewey Class. No.: </label>621.382  BIS;1