Williams, Emrys <br/><br/>
Electric Filter Circuits :  an introductory course / 
Emrys Williams. 
 - London :  Sir Isaac Pitman & Sons,  1963. 
 - viii,163 p. :  ill.;   21 cm. 
<br/><br/> Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric Filters.