Das, P.N. <br/><br/>
Line telegraph/ 
P.N. Das 
 - 2nd ed. 
 - Calcutta:  Modern Book Agency,  1965 
 - 197 p.;  21 cm. 
<br/><br/> Includes index 
<br/><br/>Bibliography: p. 191 -192 
<br/><br/><label>ISBN: </label> Rs. 9.00 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telegraph<br/>Telecommunication<br/>Telegraph wire<br/>Telegraph lines<br/>Telegraph lines--Design and constructions
<br/><br/><label>Dewey Class. No.: </label>621.382