TY  - BOOK
AU  - Held,Gilbert
TI  - Understanding data communications: from fundamentals to networking 
SN  - 0471930512
U1  - 621.382 22
PY  - 1991///]
CY  - West Sussex, England
PB  - John Wiley & Sons Ltd
KW  - Data transmission systems
KW  - BUEsh
KW  - Computer networks
KW  - GGEN
KW  - August2020
KW  - Reading book
N1  - Includes index
ER  -