TY  - BOOK
AU  - Biswas, Nripendra N.
TI  - Princples of Telephony
SN  - 0-210-22312-X
U1  - TBB D66,48 L0;14 
PY  - 1970///
CY  - Bombay
PB  - Asia Publishing
N1  - Includes index
ER  -