| ID | 047625 |
| Call Number | 909/GAR |
| Title Proper | Decoding history |
| Other Title Information | the battle of the Atlantic and Ultra |
| Language | ENG |
| Author | Gardner, W J R |
| Publication | Houndmills, Macmillan Press Ltd, 1999. |
| Description | xvii, 263p. Hbk+ 24cm. |
| Standard Number | 0333693035 |
| Price. Qualification | UKP 45.00 |
| Classification Number | 909 |
| Key Words | Case Study - 1941 ; World War ; Atlantic Campaign ; Convoy Warfare ; Signals Intelligence |