| Reference | Title | Date |
| RHP146000 | National Coal Board Inspectorate plans of workings | 1957- |
| RHP146000/427 | Plans of workings at Ordnance Survey National Grid Reference NS 26/8291 Polmaise Colliery, Drypow, Bandeath House, South Cockspow, Hartsmailing and Redhall noted on these plans. | 1957-1959 |