Files W.F.F. Archive Correspondence, Memoranda, and Personnel File Records Correspondence Between Friedman and Mendelsohn Regarding ADFGVX Cipher, 1935-1936.
Letter to Charles Mendelsohn from W.F. Friedman Re Cryptography
Letter to W.F. Friedman Concerning the ADFGVX Cipher
Letter to W.F. Friedman Discussing Cipher Work from Charles Mendelsohn
Letter to W.F. Friedman from Charles Mendelsohn
Letter to W.F. Friedman from Charles Mendelsohn Discussing Technical Paper and Alphabets
Letter to W.F. Friedman Re ADFGVX Cipher Associated Work (from C. Mendelsohn)
Notes on ADFGVX Solution
Personal Letter to W.F. Friedman from C.M (Charles Mendelsohn)
Reply to Notes on ADFGVX Cipher