Silber, Jules Crawford. [from old catalog] <br/><br/>
The invisible weapons, 
by J. C. Silber; with a foreword by Major-General Edward Gleichen. 
 - London,  Hutchinson & co., limited,  1932. 
 - 288 p.  illus. (facsims.)  22 cm. 
<br/><br/> The story of a German secret service agent who was employed by the British Postal censorship during the war. 
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<br/><br/><label>Subjects--Topical Terms: </label><br/>World War, 1914-1918--Censorship--Great Britain.<br/>World War, 1914-1918--Propaganda.<br/>World War, 1914-1918--Secret service--Germany.
<br/><br/><label>Dewey Class. No.: </label>940.2  / SIL