Reference | Title | Date |
RHP146000 | National Coal Board Inspectorate plans of workings | 1957- |
RHP146000/608 | Plans of workings at Ordnance Survey National Grid Reference NS 26/9466 Polkemmet Colliery, Tippethill No. 1 Mine, Tippethill No. 2 Mine, Northrigg No. 2 Mine, Northrigg Colliery, Courston No. 1 Pit and Gordon Pit noted on these plans. | 1958-1961 |