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  1. La police secrète prussienne
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    Victor Tissot
    La police secrète prussienne
  2. Twenty-five years in the Secret Service: The recollections of a spy
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    Henri Le Caron
    Twenty-five years in the Secret Service: The recollections of a spy
  3. Toying with fate; or, Nick Carter's narrow shave
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    Nicholas Carter
    Toying with fate; or, Nick Carter's narrow shave
  4. My Secret Service: Vienna, Sophia, Constantinople, Nish, Belgrade, Asia Minor, etc.
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    Man who dined with the Kaiser
    My Secret Service: Vienna, Sophia, Constantinople, Nish, Belgrade, Asia Minor, etc.
  5. Double Crossed
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    W. Douglas Newton
    Double Crossed
  6. The Cosmic Bluff
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    Mack Reynolds
    The Cosmic Bluff
  7. A Stolen Name; Or, The Man Who Defied Nick Carter
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    Nicholas Carter
    A Stolen Name; Or, The Man Who Defied Nick Carter
  8. Battlefield in Black
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    George A. Whittington
    Battlefield in Black
  9. The Young Wireless Operator—With the U. S. Secret Service
Winning his way in the Secret Service
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    Lewis E. Theiss
    The Young Wireless Operator—With the U. S. Secret Service
Winning his way in the Secret Service
  10. Ten Days in a Mad-House; or, Nellie Bly's Experience on Blackwell's Island.
Feigning Insanity in Order to Reveal Asylum Horrors. The Trying Ordeal of the New York World's Girl Correspondent.
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    Nellie Bly
    Ten Days in a Mad-House; or, Nellie Bly's Experience on Blackwell's Island.
Feigning Insanity in Order to Reveal Asylum Horrors. The Trying Ordeal of the New York World's Girl Correspondent.
  11. Tracked by Wireless
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    William Le Queux
    Tracked by Wireless
  12. Imported Americans
The Story of the Experiences of a Disguised American and His Wife Studying the Immigration Question
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    Broughton Brandenburg
    Imported Americans
The Story of the Experiences of a Disguised American and His Wife Studying the Immigration Question
  13. Ruby Roland, the Girl Spy; or, Simon Kenton's Protege
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    Frederick Whittaker
    Ruby Roland, the Girl Spy; or, Simon Kenton's Protege
  14. The World's Greatest Military Spies and Secret Service Agents
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    George Barton
    The World's Greatest Military Spies and Secret Service Agents

  15. Inside the Lines

    Earl Derr Biggers

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    Earl Derr Biggers
    Inside the Lines
  16. The German Spy in America
The Secret Plotting of German Spies in the United States and the Inside Story of the Sinking of the Lusitania
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    John Price Jones
    The German Spy in America
The Secret Plotting of German Spies in the United States and the Inside Story of the Sinking of the Lusitania
  17. The Man Who Was Six
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    F. L. Wallace
    The Man Who Was Six

  18. The Mystery Ship: A Story of the 'Q' Ships During the Great War

    Percy F. Westerman

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    Percy F. Westerman
    The Mystery Ship: A Story of the 'Q' Ships During the Great War
  19. Dave Dawson in Libya
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    Robert Sidney Bowen
    Dave Dawson in Libya
  20. Frank Armstrong, Drop Kicker
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    Matthew M. Colton
    Frank Armstrong, Drop Kicker
  21. Spies and Secret Service
The story of espionage, its main systems and chief exponents
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    Hamil Grant
    Spies and Secret Service
The story of espionage, its main systems and chief exponents
  22. Fighting the Boche Underground
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    H. D. Trounce
    Fighting the Boche Underground
  23. The Flying Spy
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    Camillo De Carlo
    The Flying Spy
  24. Secret Service; or, Recollections of a City Detective
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    Andrew Forrester
    Secret Service; or, Recollections of a City Detective
  25. Knots Untied; Or, Ways and By-ways in the Hidden Life of American Detectives
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    George S. McWatters
    Knots Untied; Or, Ways and By-ways in the Hidden Life of American Detectives

  26. Fräulein Doktor: Roman

    Fr. Lehne

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    Fr. Lehne
    Fräulein Doktor: Roman
  27. Hands Up; or, Thirty-Five Years of Detective Life in the Mountains and on the Plains
Reminiscences by General D. J. Cook, Chief of the Rocky Mountains Detective Association
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    D. J.‏ ‎ Cook
    Hands Up; or, Thirty-Five Years of Detective Life in the Mountains and on the Plains
Reminiscences by General D. J. Cook, Chief of the Rocky Mountains Detective Association

  28. Bernard Treves's Boots: A Novel of the Secret Service

    Yazar Bilinmiyor

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    Yazar Bilinmiyor
    Bernard Treves's Boots: A Novel of the Secret Service

  29. British Secret Service During the Great War

    Nicholas Everitt

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    Nicholas Everitt
    British Secret Service During the Great War
  30. Under Cover
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    Wyndham Martyn
    Under Cover
  31. General Washington's spies on Long Island and in New York
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    Morton Pennypacker
    General Washington's spies on Long Island and in New York

  32. Mémoires de Vidocq, chef de la police de Sureté jusqu'en 1827, tome II

    Eugène François Vidocq

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    Eugène François Vidocq
    Mémoires de Vidocq, chef de la police de Sureté jusqu'en 1827, tome II
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