Silber, J. C. <br/><br/>
The invisible weapons / 
by J. C. Silber 
 - London :  Hutchinson,  1932 
 - 300 p. ;  22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>World War 1939-1945--Secret service--Germany<br/>World war, 1939-1945--Censorship--Great Britain<br/>World war, 1939-1945--Poopaganda
<br/><br/><label>Dewey Class. No.: </label>940.48743