Reference | Title | Date |
RHP146000 | National Coal Board Inspectorate plans of workings | 1957- |
RHP146000/404 | Plans of workings at Ordnance Survey National Grid Reference NS 26/8234 Bellfield, Netherfield, Newside, Middlefield, Nethertown and Midtown noted on these plans. | 1960-1961 |