TY  - BOOK
AU  - Roddy,Dennis
AU  - Coolen, John
TI  - Electronic communications
SN  - 9718636323
U1  - 621.38 R61e 1984 3
PY  - 1984///
CY  - Reston, Virginia
PB  - Prentice Hall Company
N1  - Includes Index
ER  -