Ryder, R. W. <br/><br/>
Earthing principles and practice. 

 - London,  Pitman  [1952] 
 - xi, 108 p.  illus.  22 cm. 
<br/><br/>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric currents--Grounding.<br/>MCE
<br/><br/><label>Dewey Class. No.: </label>621.319  / RYD