TY  - BOOK
AU  - Held,G.
TI  - Understanding data communications
SN  - 8120310802 (paperback)
U1  - 004.6HEL 
PY  - 1996///
CY  - New Delhi
PB  - Sams Publishing
KW  - Data Communications
UR  - http://www.amazon.com/exec/obidos/ASIN/8120310802/chopaconline-20
ER  -