TY  - BOOK
AU  - Downing,J.G.
AU  - Henley,Martin
TI  - Communications
U1  - 385 
PY  - 1967///
CY  - Exeter
PB  - Wheaton
KW  - Optical communications
KW  - Juvenile literature
KW  - Fiber optics
N1  - Includes index
ER  -