Reference | Title | Date |
RHP146000 | National Coal Board Inspectorate plans of workings | 1957- |
RHP146000/699 | Plans of workings at Ordnance Survey National Grid Reference NT 36/1090 Townhill Colliery, Townhill No. 7 Pit, Muirbeath Colliery, Highholm and Muircockhall named on these plans. | 1960-1962 |