Fifty Years of Coal-mining Productivity: The Record of the British Coal Industry before 1939
研究了两次世界大战之间英国煤矿生产率的逆转趋势，分析了1914年前生产率下降及区域差异，发现苏格兰整体生产率最高，而达勒姆和诺森伯兰的采煤工作面生产率领先，1930年代北米德兰兹的矿井生产率增长超过其他地区。
A downward trend in British coal-mining productivity was reversed between the world wars. Declining productivity before 1914 was accompanied by wide regional differences, especially at the coalface. Scotland attained the best overall. productivity, while coalface productivity was highest in Durham and Northumberland. Regional differences narrowed by the 1920s but re-emerged in the 1930s, as mines in the North Midlands outpaced the productivity gains made elsewhere. Only a multifaceted interpretation can explain these distinctive patterns—over time, between regions, and at different stages of the coal-mining operation.