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
1927-1934
NCB/A/BUT/13/10/5
1931-1934
Bryan Donkin Company Ltd of Chesterfield, engineering firm