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| Archive Reference / Library Class No. | NCB/A/BUT/7/21/5 |
| Former Reference | N5/144/5 |
| Title | Butterley Company correspondence file on unleased minerals on the Osmaston estate at Lenton, with neighouring coal already worked by the Clifton Colliery Company Ltd. |
| Date | Sep 1930 |
| Description | Coloured plan showing lease and fault lines at Lenton, Jul 1927, scale 6 inches to 1 mile, 76 cm x 35 cm. |
| Extent | 1 file |
| Level | File |
| Repository | Derbyshire Record Office |
| Archive Creator | Butterley Company |
| National Coal Board |