| Reference | Title | Date |
| RHP146000 | National Coal Board Inspectorate plans of workings | 1957- |
| RHP146000/450 | Plans of workings at Ordnance Survey National Grid Reference NS 26/8463 Histrigg Colliery, Dewshill Colliery and Duntilland No.3 Pit noted on these plans. | 1960-1961 |