| Reference | Title | Date |
| RHP146000 | National Coal Board Inspectorate plans of workings | 1957- |
| RHP146000/192 | Plans of workings at Ordnance Survey National Grid Reference NS 26/5626 Sorn Colliery, Holehouse Hillhead, Westtown, Daldilling, Waterside and Glenlogan House noted on these plans. | n.d. |