TY  - BOOK
AU  - A.B.CARLSON & D B. CRILLY.
TI  - COMMUNICATION SYSTEMS (MCGRAW-HILL)
SN  - NULL
U1  - 621.38043/ CAR. 
PY  - 2002///
CY  - NULL
PB  - Mc. G
KW  - NULL
ER  -