Correspondence Between W.A. Todd, MI3 and Superintendent Bavin, BSC Re: Security of Teletype, October-December 1942
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LAC RG24-C-1, Microfilm reel number: C-5286--C-5287, File number: 8901
LAC RG24-C-1, Microfilm reel number: C-5286--C-5287, File number: 8901