Reference | Title | Date |
RHP146000 | National Coal Board Inspectorate plans of workings | 1957- |
RHP146000/512 | Plans of workings at Ordnance Survey National Grid Reference NS 26/8862 Benhar Colliery, Brownhill No.16 Pit and Calderhead [written in pencil] noted on these plans. | 1956-1962 |