Files W.F.F. Archive Correspondence, Memoranda, and Personnel File Records Correspondence Found by William Friedman In 1947. the Correspondence Is Between Colonel Mauborgne and George Fabyan (1917-1919) Which Was Forwarded by Fabyan to Brigadier General M. Churchill (1919), Director of Military Intelligence. Subject of Correspondence Covers the at and T Cipher Machine, Riverbank Laboratories, and Running Key Ciphers. Friedman Inserted Margin Notes Commenting on Content, 1919-1947
Letter to General Churchill from Colonel Fabyan Re Cipher Issues
Letter to General Churchill from Major Yardley; Discussion of Riverbank, Col Fabyan and Running Key
Letter to General M. Churchill from Colonel Fabyan
Letter to Major Yardley from Brigadier-General Churchill; Copies of Letters to Col Fabyan