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Includes contemporary correspondence concerning MHAN's appointment at Bletchley Park and the development of the code breaking machine 'Colossus'; other memorobilia from the code breaking school; papers relating to books, articles and TV and radio programmes concerning the development of 'Colossus' and computing in general.

Includes correspondence discussing mathematical theories and work of the respective writers and recipients, information regarding mathematical conferences and lectures, a mathematical problem by MHAN, and a draft paper on topology.

Early letters and documents 1916-19, and related items; items relating to Cambridge University and Manchester University.

Papers concerning MHAN's parents; correspondence with family members; items concerned with Will and estate; obituaries and documents regarding memorial service; miscellaneous documents; appointment diaries.

Letters to Cambridge University friends, some concerning personal relationships; a large collection of correspondence with J.H.C. Whitehead, mainly concerning mathematical subjects; a few papers concerning Alan Turing; correspondence with other friends.