Butterley Company correspondence file on Hartshay Training Centre Including plans of Butterley Company Training School at the disused Hartshay Colliery, duties of supervisor, notes for guidance of instructors for training course, printed copy of first report of the Committe on the Recruitment of Juveniles in the Coal-Mining Industry, HMSO, 1942, typed notes on the visit of the National Association of Colliery Managers on 28 Oct 1944, and monthly reports of the Training School, Aug 1944-March 1945 Aug 1944-Jul 1945