TY  - BOOK
AU  - Biswas, Nripendra, N 
TI  - Principles of telegraphy 
SN  - 81-85099-04-9 
U1  - 621.385 7 BIS  
PY  - 1998///
CY  - Media promoters 
PB  - Bombay 
KW  - TELEPHONY
ER  -