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Before Bletchley Park: The Codebreakers of the First World War Paul Gannon
Before Bletchley Park: The Codebreakers of the First World War
Paul Gannon
A fully revised and updated account of the author's acclaimed book Inside Room 40
352 pages, 8 Plates, black and white; 20 Illustrations, black and white
| Media | Books Hardcover Book (Book with hard spine and cover) |
| Released | September 1, 2021 |
| Original release date | 2020 |
| ISBN13 | 9780750992466 |
| Publishers | The History Press Ltd |
| Pages | 352 |
| Dimensions | 242 × 167 × 30 mm · 703 g |
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