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Keywords:
TUNNELS,
LININGS,
CLAYS,
CONCRETE,
SHIELDS,
RAILWAYS,
TUNNELLING,
BLUE CLAY,
IN SITU,
RINGS,
CONSTRUCTION,
BLOCKS,
CEMENT,
DRIVING,
COSTS,
BRITISH RAILWAYS EASTERN REGION,
POTTERS BAR,
UK
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© Thomas Telford and ICE
1962
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