Papers on the breaking of Italian and German Enigma codes, including Mavis Batey's recollections of her work deciphering codes at Bletchley Park; and materials on the life and work of Alfred Dillwyn "Dilly" Knox and Alan Turing for the preparation of talks and commemorative exhibitions at Bletchley Park. With draft of Mavis Batey's article 'Breaking Machines with a Pencil' for The Turing Guide, ed. Jack Copeland et al (Oxford University Press, 2017), and various other magazine articles. Also includes correspondence between Mavis Batey and Frode Weierud, cryptologist; letter from Stanislaw Komorowski, Polish Ambassador to the U.K. to Mavis Batey; and photocopies of original correspondence from Alfred Dillwyn Knox, with Mavis Batey's annotations.