Thomson J. <br/><br/>
Frequency conversion   
by J. Thomson, W. E. Turk, M. J. Beesley. 
 - London  Wykeham  1969 
 - viii, 207p. 
 - Wykeham technological series .
<br/><br/><label>Dewey Class. No.: </label>621.3136  / N69