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Keywords:
OUTPUT,
ENERGY,
COAL,
MINERS,
WORK,
OXYGEN,
CONSUMPTION,
FOOD,
CALORIES,
EFFICIENCY,
ERGONOMICS,
CONDITIONS,
COALFIELDS,
PHYSIOLOGY,
SALT,
NUTRITION,
COLLIERIES,
MINES,
MINING,
WORKING
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© Thomas Telford and ICE
1936
