| Reference | Title | Date |
| RHP146000 | National Coal Board Inspectorate plans of workings | 1957- |
| RHP146000/573 | Plans of workings at Ordnance Survey National Grid Reference NS 26/9262 Benthead No.4 Pit, Benthead No.5 Pit, Crofthead Colliery, Cultrigg Colliery and Polkemmet Colliery noted on these plans. | 1956-1961 |