Farago, Peter Stephen. <br/><br/>
Free-electron physics 
[by] P. S. Farago. 
 - Harmondsworth,  Penguin,  1970. 
 - Penguin library of physical sciences: physics  Penguin education .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0140800999  30/- 
<br/><br/><label>LCCN: </label>71551323 
<br/><br/><label>Nat. Bib. No.: </label>B70-29024 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electron optics.<br/>Vacuum-tubes.
<br/><br/><label>LC Class. No.: </label>QC447  / .F36 
<br/><br/><label>Dewey Class. No.: </label>537.5