TY  - BOOK
AU  - Held, 1943- 
TI  - Data communications networking devices 
T2  - Wiley communications technology
SN  - 0471930725 
U1  - 004.6 HEL 1992 
PY  - 1992///
CY  - Chichester
PB  - John Wiley & Sons
KW  - Computer networks
KW  - Equipment and supplies
KW  - Data transmission systems
N1  - Includes index
ER  -