1914 - 1920 Beginnings 1920 - 1939 Between the Wars 1939 - 1945 The War Years 1945 - 1965 The Development of Mechanisation 1947 - 1965 Employment of Foreign Labour 1965 - 2010 Closure & Beyond Underground Problems and Changes on the Surface Miscellaneous Contents 1947 - 1965 Sports, Welfare & Worker Participation