Author: Winterbothm, F. W.,
Title: The Ultra Secret.
Description: NY, Harper & Row, (1974). 1st US ed. VG in VG DJ. In 1939 just before the outbreak of WWII British intelligence achieved an outstanding cryptanlysis coup which enabled them to. obtain a precise copy of the highly secret & complex German coding machine known as Enigma. DJ price clipped & edge wear, owner inscription flyleaf.

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