TY  - BOOK
AU  - Bates,Regis J.
AU  - Bates Marcus
TI  - Principles of voice & data communications
SN  - 0072257326 
AV  - TK5101 .B38 2007
PY  - 2007///
CY  - Boston
PB  - McGraw-Hill Irwin
KW  - Telecommunication
N1  - Includes index
ER  -