Cracking Code Book, , HarperCollins Publishers, Simon Singh,Children’s / Teenage general interest: Mathematics and numbers,Children’s / Teenage general interest: Science and technology, codes;codebreaking;cyptology;the Enigma,, , United Kingdom, en-UShttps://www.harpercollins.co.ukcodes;codebreaking;cyptology;the Enigma, [BLURB],[CITY],,books, ebooks, biblet, Book2look