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Reference

NCB/A/BUT/13/10/3

Butterley Company file of reports of the Coal Survey Laboratory, Nottingham, analysing quality of...

1927-1932

Butterley Company

Derbyshire Record Office

NCB/A/BUT/13/10/4

Butterley Company file of reports of the Coal Survey Laboratory, Nottingham, analysing quality of...

1927-1934

Butterley Company

Derbyshire Record Office

NCB/A/BUT/13/10/5

Butterley Company file of reports of the Coal Survey Laboratory, Nottingham, analysing quality of...

1931-1934

Butterley Company

Derbyshire Record Office