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Keywords:
RAILWAYS,
VENTILATION,
LIFTS,
HYDRAULIC,
EXCAVATIONS,
TUNNELS,
WATER,
PUMPING,
LIGHTING,
PASSENGERS,
EXCAVATING,
UNDERGROUND,
ROCKS,
TUNNELLING,
VENTILATORS,
SUBAQUEOUS,
RIVERS,
UNDERWATER,
GRADIENTS,
BEDS,
RAMS,
CAGES,
SHAFTS,
COSTS,
EFFICIENCY,
ENGINES,
MERSEY,
LIVERPOOL,
BIRKENHEAD,
ENGLAND,
UK
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© Thomas Telford and ICE
1886
