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Keywords:
M AND H TUNNEL AND CIVIL ENGINEERING LTD,
CLEVELAND BRIDGE AND ENGINEERRING LTD,
CONSTRUCTION,
ROCKS,
SUPPORTS,
SAFETY,
METHODS,
TWIN,
REINFORCED,
COSTS,
GEOLOGY,
CONDITIONS,
SANDSTONE,
TUNNELS,
TEMPORARY,
DRIVING,
ECONOMICS,
LARGE,
CAST,
CONCRETE,
A40,
EXCAVATING,
CARRIAGEWAYS,
SOLUTIONS,
SOFT,
ROOFS,
STABILITY,
SHIELDS,
DIAMETER,
IN SITU,
LININGS,
TUNNELLING,
GROUND,
MARL,
MONMOUTH,
WALES,
UK
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© Thomas Telford and ICE
1970
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