TY  - BOOK
AU  - Biswas,Nripendra Nath
TI  - Principles of telegraphy / 
U1  - 621.382 BIS 
PY  - 1964///, repr., 1966
CY  - London : 
PB  - Asia Publishing House , 
KW  - Telegraph
N1  -  Includes bibliographical references
ER  -