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Keywords:
STRATA,
CONTROL,
COAL,
MINES,
RESEARCH,
MEASUREMENT,
PROPS,
MINING,
PRESSURE,
PACKS,
SUPPORTS,
ROOFS,
LOADS,
FALLS,
DYNAMOMETERS,
INSTRUMENTATION,
WEATHERING,
ROCKS,
INSTRUMENTS
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© Thomas Telford and ICE
1939
