TY  - GEN
AU  - Held, Gilbert
TI  - Data communication components: characteristics, operation, applications
SN  - 0810451263
U1  - 004.6 
PY  - 1979///
CY  - New Jersey
PB  - Hayden book company
KW  - INTERFACING AND COMMUNICATIONS
KW  - COMPUTER SCIENCE
ER  -