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Keywords:
TUNNELS,
RAILWAYS,
VALLEYS,
EXCAVATION,
PLANT,
HEADINGS,
COMPRESSED,
AIR,
EXPLOSIVES,
COSTS,
ARCHING,
MOUNTAINS,
ROCKS,
DRILLS,
DYNAMITE,
GELIGNITE,
TUNNELLING,
COMPRESSED,
AIR,
LIMESTONE,
MUSHKAF,
BOLAN,
PANIR,
BALUCHISTAN,
INDIA,
PAKISTAN,
ASIA
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© Thomas Telford and ICE
1897
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