Telecommunications /
Allen, John.
Telecommunications / [Book]. John Allen. - London : Macmillan, 1990. - x, 117p. : col. ill. ; 28 cm. - University of Bath/Macmillan Science 16-19 project. .
Includes index.
0333476271
Telecommunication systems.
Telecommunications / [Book]. John Allen. - London : Macmillan, 1990. - x, 117p. : col. ill. ; 28 cm. - University of Bath/Macmillan Science 16-19 project. .
Includes index.
0333476271
Telecommunication systems.