Reference | Title | Date |
RHP146000 | National Coal Board Inspectorate plans of workings | 1957- |
RHP146000/832 | Plans of workings at Ordnance Survey National Grid Reference NT 36/3269 Dalkeith Colliery, Woolmet Colliery, Wester Millerhill, Castle Steads, Newton, Wellington Farm, Hope Cottage, Easter Millerhill, Longthorn, Edmonstone Iron Works and Wellington House named on these plans. | [20th Century] |