Reference | Title | Date |
RHP146000 | National Coal Board Inspectorate plans of workings | 1957- |
RHP146000/805 | Plans of workings at Ordnance Survey National Grid Reference NT 36//3065 Bilston Glen Colliery, Lady Victoria Colliery, Lingerwood Colliery, Polton Colliery, Easthouses Colliery, Bonnyrigg, St Leonards Mill, Dalhousie Mains Dairy and Sandydean Bridge named on these plans. | 1959-1981 |