TY  - BOOK
AU  - Held, Gilbert
TI  - Voice & data internetworking
SN  - 9780072131833 (Pbk)
U1  - 621.385 
PY  - 2001///
CY  - New York
PB  - McGraw-Hill, 
KW  - Data transmission systems
N1  - Includes index
ER  -