SPANGENBERG, Karl R. <br/><br/>
Vacuum Tubes 
/[by] Karl R. Spangenberg 
 - New york  Mcgraw-Hill book co.  1948 
 - xvii, 860 p. 
<br/><br/> Includes appendixes and index 
<br/><br/><label>Dewey Class. No.: </label>621.38151  / SPA