1942 Restricted Military Cryptanlysis Part 1

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Rare book put out by the War Department, Office of the Chief Signal Officer Washington DC in 1942. The front cover says "Restricted" and has a Notice- "This document contains information affecting the national defense of the US within the meaning of the Espionage Act (USC, 50:31,32). The transmission of this document or the revelation of its contents in any manner to any unauthorized person is prohibited".

Includes principles, distributions, cipher alphabets etc.

It is 10.25 X 7.75". 142 pages.
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