Photostat copies of pages 252-279 of unidentified book on ciphers, showing frequency of occurence of letters in several languages.

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Bibliographic Details
Format: Manuscript
Language:English
Subjects:
World War, 1939-1945 > Secret service > Germany
World War, 1939-1945 > Secret service > Ireland
World War, 1939-1945 > Cryptography
Cryptographers > Ireland
Ireland > Foreign relations > Germany
Germany > Foreign relations > Ireland > 1939-1945
Notes:Positive and negative photostat copies.

Physical description: 2 items (28 pages).

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Arrangement:Item
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Photostat copies of pages 252-279 of unidentified book on ciphers, showing frequency of occurence of letters in several languages.

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Bibliographic Details
In Collection: Richard J. Hayes Papers, 1902-1976.
Language:English
Extent:2 items (28 pages).
Format:Manuscript
Call Number: MS 22,984/23 (Manuscripts Reading Room)
Rights:Reproduction rights owned by the National Library of Ireland.