Chairman CRC to Chairman, London Signal Intelligence Board with cover note from J. Black, 4 March 1950
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LAC R219/RG25 - 2016-00628-5, Box 14, dossier 9-2/186-3, Part 1.
LAC R219/RG25 - 2016-00628-5, Box 14, dossier 9-2/186-3, Part 1.