Biswas,N. N. <br/><br/>
Principles Of Telegraphy 

 - 1st 
 - Mumbai   Media promters & Publishers pvt Ltd  1985 
 - 185p. 
<br/><br/><label>Subjects--Personal Names: </label>
<br/><br/><label>Dewey Class. No.: </label>004.6/B621p