Notebook written by Alan Turing during World War II sold for £700,000 . The notebook was found in a cupboard at Bletchley Park and is believed to have been used by the mathematician while working on his work with code-breaking machines. Only extensive Turing manuscript thought to exist , auctioneer said .
Notebook written by Alan Turing during World War II sold for £700,000 . It was written at the Bletchley Park code-breaking headquarters in 1942 . Only extensive Turing manuscript thought to exist , auctioneer said .