TY  - BOOK
AU  - Held,Gilbert
TI  - Understanding data communications
SN  - 0672322161
AV  - TK5105 H429 2002
U1  - 004.6 H.G.U 2002 21
PY  - 2002///
CY  - Boston
PB  - Addison-Wesley
KW  - Data transmission systems
KW  - Computer networks
N1  - Includes bibliographical references and index
ER  -