References
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- Subject Yardley: Matters Pertaining to Publication Authorized by Former Chief of Cryptanalysis of U.S. War Department's Intelligence Bureau, 10 June 1931, Chief of Telegraph Section, Foreign Ministry, “Docs re Yardley & Japan, ca 1930,” Document 207, Herbert O. Yardley Collection, Record Group 457, National Archive and Records Administration, College Park, MD .