Donegan, B., Costello, M. J., & Irish Free State. Army. (1924). 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.
MLA CitationDonegan, B., et al. 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.
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