Downing, J. G. <br/><br/>
Communications / 
J. G. Downing. illustrated by Martin Henley 
 - Exeter :  Wheaton,  1967 
 - 79 p. :  ill. ;  22 cm. 
<br/><br/> Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Optical communications--Juvenile literature<br/>Fiber optics--Juvenile literature
<br/><br/><label>Dewey Class. No.: </label>385