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| Archive Reference / Library Class No. | NCB/A/BUT/8/3/70 |
| Former Reference | N5/368 |
| Title | Plan of workings at Portland Colliery in the Top Hard Coal between 1903-1907 |
| Date | [1908] |
| Description | Scale 2 chains to 1 inch. Also showing workings of New Hucknall Colliery Company and boundary for Kirkby Colliery workings. Folded up. |
| Extent | 1 item |
| Level | Item |
| Repository | Derbyshire Record Office |
| Archive Creator | National Coal Board |
| Butterley Company |
| Format | Map/Plan |
| Dimensions | 232cm x 136cm |