Richards, J. P. G. <br/><br/>
Waves / 
J. P. G. Richards 
 - Harmondsworth :  Penguin Books,  1972 
 - 192 p. ;  21 cm. 
<br/><br/> Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electromagnetic waves--Transmission