| Description | Published rules of the Derbyshire Miners' Association (DMA) for 1924; of the National Union of Mineworkers (NUM) for the years 1947 and 1962; of the NUM Derbyshire Area for the years 1949 and 1965; and of the NUM's Derbyshire, Nottinghamshire and Midland Counties Enginemen, Firemen, Motormen and Electricians' Area for 1957. |