Essential Matters: History of the Cryptographic Branch of the People's Army of Vietnam 1945-1975 (with a Supplement Drawn from "The History of the Cryptographic Branch of the Border Guard, 1959-1989")
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Essential Matters: History of the Cryptographic Branch of the People's Army of Vietnam 1945-1975 (with a Supplement Drawn from "The History of the Cryptographic Branch of the Border Guard, 1959-1989")
