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Keywords:
TUNNELS,
URBAN,
ROADS,
TUBES,
MECHANICAL,
LANES,
ROCKS,
PROJECTS,
HIGHWAYS,
MACHINERY,
TRAFFIC,
EXCAVATORS,
PILOT,
CONDITIONS,
ENVIRONMENT,
TUNNELLING,
LININGS,
MOLES,
DRIVING,
VENTILATION,
CONCRETE,
MERSEY,
KINGSWAY,
LIVERPOOL,
UK
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© Thomas Telford and ICE
1973
