William F. Friedman NSA Archive - United States Communications Intelligence Board (USCIB) Classification Principles for Reference to Signals Intelligence (SIGINT) Matters In Lectures, 1949-1953 - 4in1

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Files W.F.F. Archive Panel, Committee, and Board Records United States Communications Intelligence Board (USCIB) Classification Principles for Reference to Signals Intelligence (SIGINT) Matters In Lectures, 1949-1953

Classification of Subject Matter Relating to Communication Intelligence

Document A54919

USCIB SIGINT Classification Principles

Document A54917