TY  - BOOK
AU  - Gregory, Donald W.
AU  - Bates, Regis JGregory, Donald W.
TI  - Voice and data communications handbook
SN  - 9780070472815
AV  - 621.382 BAT 2001 
U1  - 621.382 BAT 2001 
PY  - 2001///
CY  - New Delhi
PB  - Tata McGraw-Hill
KW  - Communication Engineering
ER  -