TY  - BOOK
AU  - Coates,R.F.W.
TI  - Modern communication systems
SN  - 9780333358320
AV  - SJMC TK5101.C56 
PY  - 1975///
CY  - London
PB  - Macmillan Education ltd
KW  - Communication
N1  - Include bibliographical references and index
ER  -