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Keywords:
UK,
FRANCE,
CHANNEL TUNNEL,
ENGLISH CHANNEL,
ENGLAND,
CHANNEL TUNNEL,
GEOLOGY,
TUNNELS,
STRATA,
CHALK,
SEA,
SUBMARINE,
BEDS,
CLAYS,
PALAEOZOIC,
ROCKS,
GREENSAND,
COAL,
MEASURES,
TUNNELLING,
FISSURES,
BORING
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© Thomas Telford and ICE
1874
