TY  - BOOK
AU  - Held, Gilbert.
TI  - Understanding data communications: from fundamentals to networking 
SN  - 0471627453 (alk. paper); 9780470841488
AV  - TK5105 .H429 2000
U1  - 4.6 21
PY  - 2000///
CY  - Chichester :;New York
PB  - Wiley
KW  - Data transmission systems.;Computer networks
N1  - Includes index
ER  -