The code breakers of Room 40 ; the story of Admiral Sir William Hall, genius of British counter-intelligence.
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| Format: | Book |
| Language: | English |
| Published: |
New York :
St. Martin's Press,
1956.
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| Item Description: | First published in London in 1955 under title: The eyes of the Navy. |
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| Physical Description: | 212 pages : illustrations ; 23 cm. |