Das, P.N. <br/><br/>
Line telegraphy/ 
P.N. Das 
 - 3rd ed. 
 - Calcutta:  Modern Book Agency,  1974 
 - 203 p.;  21 cm. 
<br/><br/> Includes index 
<br/><br/>Bibliography: p. 197 -198 
<br/><br/><label>ISBN: </label> Rs. 12.00 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telegraph lines<br/>Telegraph wires<br/>Telegraph<br/>Telegraph lines--Design and constructions
<br/><br/><label>Dewey Class. No.: </label>621.382