| Description | Including copies of questionnaires on individual collieries from the Institution of Ming Engineers Committee on Shot Firing and its Alternatives, 1935, printed booklets and pamphlets on shotfiring and safety stemming plugs, 1935-1938 and copies of printed memorandum by the H.M. Electrical Inspector of Mines on the explosion at Markham Colliery on 21 Jan 1937 |