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Report from Lieutenant B. Donegan, Office of the Director of Intelligence, to Colonel Michael Joseph Costello, Director of Intelligence, on the letter cipher in use in Northern Ireland,

1924 November 3.

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In Collection: Ernie O'Malley Papers, 1916-1949
Main Creator: Donegan, B., Lieutenant
Language: English
Extent: 1 item (1 page).
Call Number: MS 10,973/18/9 (Manuscripts Reading Room)
Rights: Reproduction rights owned by the National Library of Ireland.