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Keywords:
NATIONAL COAL BOARD,
NCB,
COLLIERIES,
DISASTERS,
COALFIELDS,
LIQUEFACTION,
SHEAR,
FILL,
TAILINGS,
DESIGN,
DISCARDS,
ACTS,
SPOIL,
FAILURES,
TESTS,
MATERIALS,
STRENGTH,
SHALE,
COAL,
WASTE,
DEPOSITS,
TIPS,
MINES,
SLIDES,
LAGOONS,
PROPERTIES,
RESEARCH,
MINING,
FINE,
LABORATORIES,
ABERFAN,
SOUTH WALES,
UK
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© Thomas Telford and ICE
1973
