TY  - BOOK
AU  - Held,Gilbert
AU  - Friend,George E.
TI  - Understanding data communications
SN  - 0672305011 (pbk.) :
AV  - TK5105 .H429 1994
PY  - 1994///
CY  - Indianapolis, Ind.
PB  - Sams Pub.
KW  - Data transmission systems
KW  - Computer networks
N1  - Previous eds. written by George E. Friend ... et al
ER  -