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Keywords:
TUNNELS,
CONSTRUCTION,
MERSEY TUNNEL,
TUNNELLING,
CARS,
EXHAUSTS,
GAS,
CARBON MONOXIDE,
NOXIOUS,
VENTILATION,
AIR,
DUCTS,
PITOT,
TUBES,
ANEMOMETERS,
CEMENTATION,
FLOW,
VELOCITY,
INSTRUMENTATION,
MERSEY,
BIRKENHEAD,
LIVERPOOL,
UK
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© Thomas Telford and ICE
1936
