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| Archive Reference / Library Class No. | NCB/A/BUT/13/10/11 |
| Former Reference | N5/199/4 |
| Title | Butterley Company internal correspondence file on analysis of the coal quality from assorted collieries |
| Date | Apr 1945-Jan 1947 |
| Description | Relating to Ripley Colliery Piper Seam, Denby Central Washery, Butterley Drift, Denby Drift, Denby Hall Colliery Mickley and Ashgate Seams, and Ollerton Cubes |
| Extent | 1 file |
| Level | File |
| Repository | Derbyshire Record Office |
| Archive Creator | Butterley Company |
| National Coal Board |
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