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| Archive Reference / Library Class No. | NCB/A/BUT/13/10/6 |
| Former Reference | N5/16/4 |
| Title | Butterley Company correspondence file on research undertaken by Coal Survey Laboratory, Nottingham, analysing quality of coal seams, mostly for assorted non-Butterley Company collieries |
| Date | Sep 1931-Jul 1946 |
| Description | Including reports on Upper Hartshay, Ollerton (x2), Loscoe (x2), Whitleley, Langley, Denby Hall and Ormonde |
| Extent | 1 file |
| Level | File |
| Repository | Derbyshire Record Office |
| Archive Creator | Butterley Company |
| National Coal Board |
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