Richards, D. L <br/><br/>
Telecommunication by speech: the transmission performance of telephone networks 

 - London:  Butterworths  1973 
 - [xxii], 589p. 
<br/><br/> Bibliography: p. 529-577. 
<br/><br/><label>ISBN: </label>040870344x 
<br/><br/><label>Subjects--Topical Terms: </label><br/>TELEPHONE
<br/><br/><label>LC Class. No.: </label>TK 6161 Ric