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