Butterley Company correspondence file on the setting of wages for colliery deputies Including papers on arbitration and draft copy of agreement between the Butterley Company and its deputies and shot firers employed at its Nottinghamshire and Derbyshire collieries, 1945, and loose copy of agreement between the Butterley Company and its deputies and shot firers employed at its Derbyshire collieries, 2 June 1939 Mar 1944-Jul 1946