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| Archive Reference / Library Class No. | NCB/A/BUT/13/10/9 |
| Former Reference | N5/199/1 |
| Title | Butterley Company correspondence file on analysis of coal quality of the company's collieries |
| Date | Feb 1927-Dec 1931 |
| Description | Including certificates of analysis from the company's laboratories at Kirkby and from the West Ham Testing Laboratory, Plaistow |
| Extent | 1 file |
| Level | File |
| Repository | Derbyshire Record Office |
| Archive Creator | Butterley Company |
| National Coal Board |
| Format | Document |