TY  - BOOK
AU  - Held,Gilbert
TI  - Understanding data communications: from fundamentals to networking 
SN  - 9780471627459
AV  - TK 5105 .H42 2000
PY  - 2000///
CY  - Chichester, New York
PB  - Wiley
KW  - Data transmission systems
KW  - Computer networks
N1  - Includes index
UR  - http://www.loc.gov/catdir/description/wiley034/00032094.html
UR  - http://www.loc.gov/catdir/toc/onix05/00032094.html
ER  -