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| Archive Reference / Library Class No. | NCB/A/BUT/7/18/1 |
| Former Reference | N5/158/1 |
| Title | Copy correspondence of the Butterley Company relating to leases by the Duke of Portland for its Nottinghamshire collieries |
| Date | Nov 1884-May 1905 |
| Description | On leases relating to the Portland and Kirkby collieries, including on the lower mines and on coal pillars for assorted sites at Annesley, Kirkby Woodhouse |
| Extent | 1 file |
| Level | File |
| Repository | Derbyshire Record Office |
| Archive Creator | Butterley Company |
| National Coal Board |