TY  - BOOK
AU  - Couch,Leon W.
TI  - Digital and analog communication systems
SN  - 0023253800
U1  - 621.38/0413�19 
PY  - 1987///
CY  - New York
PB  - Macmillan
KW  - Telecommunication systems
KW  - Digital communications
ER  -