1. The Bletchley park codebreakers : how ultra shortened the war and led to the birth of the computer /: how ultra shortened the war and led to the birth of the computer. (2011) Other Names: Erskine, Ralph; Smith, Michael, 1952 May 1 Record Type: Book Extent: 1 online resource (xvi, 495 pages, 8 unnumbered pages of plates), illustrations View Content: Available online (eLD content is only available in our Reading Rooms) ↗