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Keywords:
STRATA,
CONTROL,
COAL,
MINES,
MOVEMENT,
INVESTIGATIONS,
LOADS,
MOVEMENT,
MEASUREMENT,
PROPS,
PACKS,
UNDERGROUND,
RESEARCH,
SUPPORTS,
EXCAVATIONS,
ROOFS,
SAFETY,
ACCIDENTS,
METHODS,
MINING,
DYNAMOMETERS,
INSTRUMENTATION,
PRESSURE,
FALLS
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© Thomas Telford and ICE
1939
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