TY  - BOOK
AU  - Firth,R.J.
TI  - Viewdata systems: a practical evaluation guide 
SN  - 0850123704
PY  - 1982///
CY  - Manchester
PB  - NCC Publications
KW  - Videotex (Data transmission system)
KW  - Viewdata (Data transmission system)
N1  - Bibliography: p81
ER  -