Butterley Company correspondence file on the proposition for leasing of the Rufford coalfield by Lord Savile Including copies of initial terns of offer, 1907-1908, special report on acquisition of Top Hard Coal at the Rufford Estate, 6 Jan 1908, copies of sections of the Top Hard Coal made by H. Eustace Mitton at Mansfield Colliery, 13 Jan 1908, and correspondence with J.A. Ball of Rufford Estates Office, Nov-Dec 1912. Dec 1907-Dec 1912