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Keywords:
OUTPUT,
ENERGY,
COAL,
MINERS,
MANUAL,
LABOUR,
FOOD,
EFFECT,
WORKING,
TEMPERATURE,
CONSUMPTION,
ERGONOMICS,
EFFICIENCY,
WORK,
PRODUCTIVITY,
CALORIES,
NUTRITION,
COLLIERIES,
MINING,
MINES,
WORKING
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© Thomas Telford and ICE
1936
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