| Description | Showing support pillars for low temperature carbonisation works, contained in agreements between the NCB, the Derbyshire Coalite Company Limted and the British Diesel Oil and Petrol Company Limited dated 30 June and 29 June 1951. Marked as plan of Markham No. 4 Survey Department. Scale 1:2500. Found among Arkwright Colliery plans, but provenance unclear. |