Reference | Title | Date |
RHP146000 | National Coal Board Inspectorate plans of workings | 1957- |
RHP146000/467 | Plans of workings at Ordnance Survey National Grid Reference NS 26/8491 No colliery names listed on these plans. Drypow, Alton, Throsk, Burnbank, Smithy and Mains of Throsk noted on these plans. | 1954-1959 |