Reference | Title | Date |
RHP146000 | National Coal Board Inspectorate plans of workings | 1957- |
RHP146000/485 | Plans of workings at Ordnance Survey National Grid Reference NS 26/8660 Ferrier's Mine, Calderhead Colliery, Hall Colliery, Dykehead No.4 Pit, Hillhouserigg Colliery and Sneddon's Pit noted on these plans. | 1958-1965 |