Butterley Company correspondence file on working under No. 8 Bridge at Outram Street in Sutton-in-Ashfield owned by the London & North Eastern Railway to prove a main fault line of the Top Hard coal worked at Kirkby Colliery Includes draft copy of agreement between Eustace Mitton, mining engineer of the Butterley Company and R. Binney Wilson, engineer of the London & North Eastern Railway for Butterley Company to work coal seams under land in Sutton-in-Ashfield and minutes from meeting between Mr Mitton and Mr Wilson, Mar 1925. Plan of Kirkby Colliery, May 1925, scale 2 chains to 1 inch, 59 cm x 68 cm. Dec 1924-Nov 1925