TY  - BOOK
AU  - Held, Gilbert ; 
TI  - Data communications:  : a comprehensive approach
SN  - 0070279748
U1  - 004.6 HEL 
PY  - 1983///
CY  - New York, N.Y. 
PB  - : Data Communications, 
KW  -  Data transmission systems.
KW  - Computer.
KW  - Data communications : a comprehensive approach
KW  - Gilbert Held
ER  -