Found 3188 books 
![[Gutenberg 55666] • 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](/cover/-q--WcJeWebrU5C8/small/[Gutenberg%2055666]%20%e2%80%a2%20The%20German%20Spy%20in%20America%20/%20The%20Secret%20Plotting%20of%20German%20Spies%20in%20the%20United%20States%20and%20the%20Inside%20Story%20of%20the%20Sinking%20of%20the%20Lusitania.jpg)
![[Gutenberg 34973] • The Spy of the Rebellion / Being a True History of the Spy System of the United States Army during the Late Rebellion](/cover/QukfBiGyLufkr8nD/small/[Gutenberg%2034973]%20%e2%80%a2%20The%20Spy%20of%20the%20Rebellion%20/%20Being%20a%20True%20History%20of%20the%20Spy%20System%20of%20the%20United%20States%20Army%20during%20the%20Late%20Rebellion.jpg)
![[Gutenberg 62885] • The Young Wireless Operator—With the U. S. Secret Service / Winning his way in the Secret Service](/cover/tYKyoetzCK-zeEhA/small/[Gutenberg%2062885]%20%e2%80%a2%20The%20Young%20Wireless%20Operator%e2%80%94With%20the%20U.%20S.%20Secret%20Service%20/%20Winning%20his%20way%20in%20the%20Secret%20Service.jpg)
![[Gutenberg 38131] • On Secret Service / Detective-Mystery Stories Based on Real Cases Solved by Government Agents](/cover/_P933tlDtyW7SMuy/small/[Gutenberg%2038131]%20%e2%80%a2%20On%20Secret%20Service%20/%20Detective-Mystery%20Stories%20Based%20on%20Real%20Cases%20Solved%20by%20Government%20Agents.jpg)
![[Gutenberg 24541] • Between the Lines: Secret Service Stories Told Fifty Years After](/cover/AG5w5cdXnJW9YoKr/small/[Gutenberg%2024541]%20%e2%80%a2%20Between%20the%20Lines:%20Secret%20Service%20Stories%20Told%20Fifty%20Years%20After.jpg)
![[Gutenberg 39574] • The Radio Boys on Secret Service Duty](/cover/no_IS6t1ZYf8aYnc/small/[Gutenberg%2039574]%20%e2%80%a2%20The%20Radio%20Boys%20on%20Secret%20Service%20Duty.jpg)
[en] [Gutenberg 39574] • The Radio Boys on Secret Service Duty A. L. Burt
![[Gutenberg 34344] • The Boy Spy / A substantially true record of secret service during the war of the rebellion, a correct account of events witnessed by a soldier](/cover/5OTAjexTbJy3eBRU/small/[Gutenberg%2034344]%20%e2%80%a2%20The%20Boy%20Spy%20/%20A%20substantially%20true%20record%20of%20secret%20service%20during%20the%20war%20of%20the%20rebellion,%20a%20correct%20account%20of%20events%20witnessed%20by%20a%20soldier.jpg)
![[Her Majesty’s Most Secret Service 04] • When a Lady Kisses a Scot](/cover/dwwX80YP_zsvtgbI/small/[Her%20Majesty%e2%80%99s%20Most%20Secret%20Service%2004]%20%e2%80%a2%20When%20a%20Lady%20Kisses%20a%20Scot.jpg)
[en] [Her Majesty’s Most Secret Service 04] • When a Lady Kisses a Scot Entangled: Amara
![[Gutenberg 2417] • Okewood of the Secret Service](/cover/FseNLeMfasXdm_IF/small/[Gutenberg%202417]%20%e2%80%a2%20Okewood%20of%20the%20Secret%20Service.jpg)
![[Gutenberg 62740] • Walker of the Secret Service](/cover/1rW-_mSIxyyJwZFy/small/[Gutenberg%2062740]%20%e2%80%a2%20Walker%20of%20the%20Secret%20Service.jpg)
![[Gutenberg 41186] • Sant of the Secret Service: Some Revelations of Spies and Spying](/cover/YsoKDK-9rDNeVj6l/small/[Gutenberg%2041186]%20%e2%80%a2%20Sant%20of%20the%20Secret%20Service:%20Some%20Revelations%20of%20Spies%20and%20Spying.jpg)
[en] [Gutenberg 41186] • Sant of the Secret Service: Some Revelations of Spies and Spying Kessinger Publishing
![[Gutenberg 10511] • A Rogue by Compulsion / An Affair of the Secret Service](/cover/OrnWqMYr-DC07BnK/small/[Gutenberg%2010511]%20%e2%80%a2%20A%20Rogue%20by%20Compulsion%20/%20An%20Affair%20of%20the%20Secret%20Service.jpg)
[en] [Gutenberg 10511] • A Rogue by Compulsion / An Affair of the Secret Service Tutis Digital Pub
![[Gutenberg 45627] • Wings Over the Rockies; Or, Jack Ralston's New Cloud Chaser](/cover/9clt7V5PHKLMwjzn/small/[Gutenberg%2045627]%20%e2%80%a2%20Wings%20Over%20the%20Rockies;%20Or,%20Jack%20Ralston%27s%20New%20Cloud%20Chaser.jpg)
[en] [Gutenberg 45627] • Wings Over the Rockies; Or, Jack Ralston's New Cloud Chaser www.DelmarvaPublications.com
![[Gutenberg 6904] • Boy Scouts in an Airship; Or, The Warning from the Sky](/cover/UcFAe5pf-xM0_JlV/small/[Gutenberg%206904]%20%e2%80%a2%20Boy%20Scouts%20in%20an%20Airship;%20Or,%20The%20Warning%20from%20the%20Sky.jpg)
[en] [Gutenberg 6904] • Boy Scouts in an Airship; Or, The Warning from the Sky IndyPublish.com
![[Gutenberg 6108] • Boy Scouts in a Submarine; Or, Searching an Ocean Floor](/cover/E-XfhtwGUewV4c9L/small/[Gutenberg%206108]%20%e2%80%a2%20Boy%20Scouts%20in%20a%20Submarine;%20Or,%20Searching%20an%20Ocean%20Floor.jpg)
![[Gutenberg 7356] • The Boy Scout Camera Club; Or, the Confession of a Photograph](/cover/js5U9LKAaU4rdACG/small/[Gutenberg%207356]%20%e2%80%a2%20The%20Boy%20Scout%20Camera%20Club;%20Or,%20the%20Confession%20of%20a%20Photograph.jpg)
![[Gutenberg 11469] • Boy Scouts on Motorcycles; Or, With the Flying Squadron](/cover/59oMCI8_0QhFo08I/small/[Gutenberg%2011469]%20%e2%80%a2%20Boy%20Scouts%20on%20Motorcycles;%20Or,%20With%20the%20Flying%20Squadron.jpg)
![[Gutenberg 31426] • Eagles of the Sky; Or, With Jack Ralston Along the Air Lanes](/cover/OvLaSjlAqzNKzBMT/small/[Gutenberg%2031426]%20%e2%80%a2%20Eagles%20of%20the%20Sky;%20Or,%20With%20Jack%20Ralston%20Along%20the%20Air%20Lanes.jpg)
[en] [Gutenberg 31426] • Eagles of the Sky; Or, With Jack Ralston Along the Air Lanes Kessinger Publishing
![[Gutenberg 45776] • The Sky Detectives; Or, How Jack Ralston Got His Man](/cover/yvi1jG5CsYlhh5WQ/small/[Gutenberg%2045776]%20%e2%80%a2%20The%20Sky%20Detectives;%20Or,%20How%20Jack%20Ralston%20Got%20His%20Man.jpg)
[en] [Gutenberg 45776] • The Sky Detectives; Or, How Jack Ralston Got His Man Createspace Independent Publishing Platform
![[Gutenberg 10996] • Whig Against Tory / Or, The Military Adventures of a Shoemaker, a Tale of the Revolution](/cover/AS4N7R-f75M65rbp/small/[Gutenberg%2010996]%20%e2%80%a2%20Whig%20Against%20Tory%20/%20Or,%20The%20Military%20Adventures%20of%20a%20Shoemaker,%20a%20Tale%20of%20the%20Revolution.jpg)