Spangenberg, Karl R. <br/><br/>
Vacuum tubes. 

 - 1st ed. 
 - New York,  McGraw-Hill Book Co.,  1948. 
 - xvii, 860 p.  illus., diagrs.  24 cm. 
<br/><br/><label>Subjects--Index Terms: </label>Vacuum-tubes 
<br/><br/><label>Dewey Class. No.: </label>621.384132  / SPA