Butterley Company correspondence file on the transfer of labour under the provisions of Essential Work Orders Including correspondence with the Ministry of Fuel and Power, correspondence and memoranda on the cases of individual workers being allotted work, including particulars of payements for the company's collieries, Jan-Apr 1944, and letters (2) from the Bachad Fellowship offering young people who were Orthodox Jews to work as volunteers in mining, Aug 1944, with the offer being turned down. May 1944-Mar 1946