Underhill, Charles Reginald,  1874- <br/><br/>
Electrons at work;  a simple and general treatise on electronic devices, their circuits, and industrial uses, 
by Charles R. Underhill. 
 - 1st ed. 
 - New York,  London,  McGraw-Hill book company, inc.,  1933. 
 - xii, 354 p.  illus.  24 cm. 
<br/><br/><label>LCCN: </label>33031443  
<br/><br/><label>Subjects--Topical Terms: </label><br/>APARATOS ELÉCTRICOS Y SUS APLICACIONES<br/>ELECTRONES