Reference | Title | Date |
RHP146000 | National Coal Board Inspectorate plans of workings | 1957- |
RHP146000/431 | Plans of workings at Ordnance Survey National Grid Reference NS 26/8295 Manor Powis Colliery, Blackgrange Smithy, Manor Steps, Manor Villa, West Gogar, Manor and Powis House noted on this plan. | 1954-1956 |