Technology: A third level course telecommunication systems,telephone systems, study supplement 

 - Milton Keynes  Open University Press  1976 
 - 43p. 
<br/><br/><label>ISBN: </label> UKP 2.10 
<br/><br/><label>Source: </label> UKP 2.10 
<br/><br/><label>Dewey Class. No.: </label>621.38 TEC