Reference | Title | Date |
RHP146000 | National Coal Board Inspectorate plans of workings | 1957- |
RHP146000/121 | Plans of workings at Ordnance Survey National Grid Reference NS 26/4806 Pennyvenie Colliery, Chalmerston Colliery and Camlarg Colliery noted on this plans. | 1954-1959 |