Armgaard Karl Graves
Armgaard Karl Graves, also known as (or accused of being) Louis Clement Van Norden, Paul W. Graumann, Paul Gunther, Paul Peter Gunther von Kanitz, etc., was a German (or Swiss) "double agent" for the German Naval Intelligence and the British MI5 before the start of the First World War, later emigrating to the United States, where he engaged in black mail, extortion, swindling, and scams of all character, resulting in his deportation in 1937 and subsequent disappearance.
- Graves, Armgaard Karl (1914), The Secrets of the German War Office, London: T. Werner Laurie, Ltd., https://archive.org/details/secretsofgermanw00grav
- Graves, Armgaard Karl, "How I Became a Secret Agent", Fifty Amazing Secret Service Dramas, Odhams Press
- Graves, Armgaard Karl (1915), The Red Secrets of the Hohenzollerns, New York: A. L. Burt Company, https://archive.org/details/secretsofhohenzo00gravrich
- Boghardt, Thomas (2004), "Armgaard Karl Graves", Spies of the Kaiser: German Covert Operations in Great Britain During the First World War Era, Palgrave Macmillan, p. 60-63, https://www.amazon.com/Spies-Kaiser-Operations-Britain-Antonys/dp/1403932484/?tag=apopheniacs-20