TY  - BOOK
AU  - Held,Gilbert
AU  - Friend,George E.
TI  - Understanding data communications
SN  - 8176350664
U1  - 004.6 22
PY  - 1999///
CY  - Indianapolis, IN
PB  - New Riders
KW  - Data transmission systems
KW  - Computer networks
N1  - Includes bibliographical references (p. [577]-579) and index
ER  -