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The Ultra Secret by F. W. Winterbotham (1974, Hardcover)
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Learn about one of the approaches taken to overcome the Nazis.
Many secrets were well kept with no leaks! The US Naval codes were broken for a short time, but fixed before too much damage was done. The story of many intelligent and patriotic workers working long hours on short deadlines.
Verified purchase: Yes | Condition: Pre-owned
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