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*[https://archive.org/details/secretcorpstaleo00tuohuoft ''The Secret Corps : a Tale of "Intelligence" on all Fronts''] by Captain Ferdinand Tuohy 1920 Archive.org. Tuohy also wrote ''The Battle of Brains'' 1930, consisting of some true stories, some semi-fiction, about Secret Service/spies, much of which had appeared serially in the ''Graphic'', available at the British Library UIN: BLL01003689091 and also available [https://books.google.com.au/books/about/The_Battle_of_Brains.html?id=foLjjgEACAAJ Snippet Google Books] currently searchable, but not viewable, should become available to those in North America etc c 2026, and similarly on HathiTrust Digital Library. Another book about his war experiences is ''The Crater of Mars'' 1929 available [https://books.google.com/books?id=dJhHAAAAIAAJ Snippet Google Books] currently searchable, but not viewable, should become available to those in North America etc c 2025. Also see a [[Western Front#Post War including British Occupation of Germany|postwar book below]]. The author was/became a news reporter and post-war foreign correspondent. *[https://archive.org/details/pt-1-detective-secret-service-days/Pt1DetectiveSecretServiceP011-025/mode/2up ''Detective & Secret Service Days''] by Edwin T Woodhall 1929. Archive.org. Mirror from [https://digitallib.stou.ac.th/handle/6625047444/1704 STOU Digital Repository] Sukhothai Thammathirat Open University, Thailand. Note, the latter website has been noticed to be unavailable at times, possibly it may only be accessible during "office hours". The 1937 edition was titled ''Detective and Secret Service Days''. The author chronicles his experiences beginning briefly with his early days in 1906 in the London Metropolitan Police Force, and then on to when he subsequently became attached to the CID at Scotland Yard, the Special Political Department, the Secret Service Department and the Special Central Department. [http://www.casebook.org/dissertations/rip-woodhall.html Details of the author] casebook.org. Elsewhere it is stated that Book II [digital Pt3] Chapter III "Military Ishmaels", page 143 is about Toplis who is discussed in an article<ref>[https://pixelsurgery.wordpress.com/2017/10/27/secret-service-days-woodhall/ "Monocled Mutineer, Percy Toplis"] pixelsurgery.com</ref>. Chapter IV, "A Charming Spy", page 156 relates to Mata Hari, see below. He was also the author of ''Spies of the Great War : adventures with the Allied Secret Service'' by Edwin T. Woodhall 1932. Extracts from the latter book are included in ''Fifty Amazing Secret Service Dramas'', available online, see below.

*[https://digitallibarchive.stou.ac.thorg/details/cockpit-of-peace/page/handlen3/6625047444mode/1954 2up ''Cockpit of Peace 1919-1925''] by Ferdinand Tuohy 1926. Link to a pdf download, STOU Digital Repository Sukhothai Thammathirat Open University, Thailand. Note, this website has been noticed to be unavailable at times, possibly it may only be accessible during "office hours"Archive. Note however, the URL may have changed to <nowiki>org mirror from [https://m.digitallib.stou.ac.th/handle/6625047444/1954</nowiki> STOU Digital Repository] Sukhothai Thammathirat Open University, Thailand. The author was a post-war foreign correspondent, also the author of ''Occupied, 1918-1930; a postscript to the western front'' published 1931, Searchable, but not viewable, on [https://catalog.hathitrust.org/Record/005906197 HathiTrust Digital Library] or [https://books.google.com/books?id=gJiQjgEACAAJ Google Books] and at the British Library UIN: BLL01012161739 . Also see his book under [[Western Front#Secret Service and Spies|Secret Service and Spies, above]].