Thompson, James Westfall,  1869-1941. <br/><br/>
Secret diplomacy :  a record of espionage and double-dealing, 1500-1815 / 
by J.W. Thompson & S.K. Padover ; with 18 illustrations. 
 - London :  Jarrolds,  1937. 
 - 286 p. :  ill ;  22 cm. 
<br/><br/> "Appendix: Cryptography": p. 253-263. 
<br/><br/>Bibliography: p. 265-278. Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Diplomacy--History.<br/>Secret service<br/>Cryptography
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Europe--Politics and government.
<br/><br/><label>Dewey Class. No.: </label>341.70903  / THS 1963