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Keywords:
COAL BOARD,
BUILDING RESEARCH STATION,
STRENGTH,
GRADING,
PORTLAND,
CEMENT,
STRUCTURAL,
ECONOMY,
STANDARDS,
QUALITY,
COAL,
HARDENING,
SHRINKAGE,
TESTING,
TECHNIQUES,
COMPRESSIVE,
HEATHROW,
UK
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© Thomas Telford and ICE
1953
