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Keywords:
NATIONAL COAL BOARD,
NCB,
DEVELOPMENT,
COAL,
MINING,
INDUSTRIES,
SHAFTS,
SINKING,
LININGS,
ENGINEERS,
UNDERGROUND,
CONSTRUCTION,
COLLIERIES,
SURFACE,
WORKS,
PRODUCTION,
ENERGY,
SUPPLY,
DEMAND,
WINDING,
TOWERS,
FREEZING,
UNDERWATER,
PITS,
UNDERSEA,
BORING,
SEA,
UK
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© Thomas Telford and ICE
1957
