Reference | Title | Date |
RHP146000 | National Coal Board Inspectorate plans of workings | 1957- |
RHP146000/223 | Plans of workings at Ordnance Survey National Grid Reference NS 26/6224 Cronberry Moor Shaft, Stonebriggs No.2 Pit and Boghead bores noted on these plans. | 1960-1961 |