| Type | Book |
|---|---|
| Contributors | Hoare, Oliver, writer of introduction, editor of compilation. |
| Languages | English |
| Publisher | Kew : Public Record Office, 2002. |
| Physical Description | 1 folder : illustrations ; 27 cm |
| ISBN | 1903365406 |
| Subjects | Cryptography. | World War, 1939-1945. |
| Holdings |
|