TY  - BOOK
AU  - Heldman,Robert K.
TI  - Information telecommunications: networks, products, & services 
SN  - 0070280401 :
U1  - 384 
PY  - 1994///
CY  - New York
PB  - McGraw-Hill
KW  - Telecommunication
KW  - Social aspects
KW  - Information networks
KW  - Information science
N1  - Includes index
ER  -