Derrick, John <br/><br/>
Telecommunications  a businessman's guide 
John Derrick and Phillip Oppenheim 
 - London  Kogan Page  1983 
 - 190p. :  ill. ;  22cm 
<br/><br/><label>ISBN: </label>0850387744 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication systems