Richards, D. L. <br/><br/>
Telecommunication by speech:  the transmission performance of telephone networks 
[by] D. L. Richards. 
 - London,  Butterworths,  1973. 
 - [24], 589 p.  illus.  24 cm. 
<br/><br/>Bibliography: p. 529-577. 
<br/><br/><label>ISBN: </label>040870344X 
<br/><br/><label>LCCN: </label>73163567  
<br/><br/><label>Nat. Bib. No.: </label>B73-08348 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telephone.
<br/><br/><label>LC Class. No.: </label>TK6161  / .R52 1973b 
<br/><br/><label>Dewey Class. No.: </label>621.385 RIC