Butterley Company correspondence file with H. Eustace Mitton, mostly on his work as a director of the company Including list of positions in the mining profession with the Mining Association of Great Britain, Midland Counties Colliery Owners' Association and other bodies, May 1934, papers on his work for the Colliery Development Committee, Sep 1938-Jul 1939, and correspondence of condolence after his death, Sep-Nov 1946 Jun 1927-Nov 1946