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Keywords:
UK,
FRANCE,
ENGLAND,
CHANNEL TUNNEL,
ENGLISH CHANNEL,
GEOLOGY,
TUNNELS,
CONSTRUCTION,
FORMATION,
PALAEOZOIC,
ROCKS,
CLAYS,
LONDON CLAY,
CHALK,
SUBMARINE,
TUNNELLING,
JURASSIC,
OOLITE,
DEVONIAN,
LIMESTONE,
STRATA,
CHANNEL TUNNEL,
SEA,
GREENSAND,
COAL,
MEASURES
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© Thomas Telford and ICE
1874
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