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Copy of letter concerning ciphers based on the letters AEIOU,

1944 Feb. 15.

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In Collection: Richard J. Hayes Papers, 1902-1976.
Main Creator: Hayes, Richard J., 1902-1976
Language: English
Extent: 1 item (1 page).
Format: MANUSCRIPT
Call Number: MS 22,984/20 (Manuscripts Reading Room)
Rights: Reproduction rights owned by the National Library of Ireland.