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51 (LI) — 1940-1941
U.S. Accident Rates, 297.
U.S. Age Standard, 293.
U.S. Bureau and Safety, 5.
U.S. Carbonisation Tests, 163.
U.S. Defence Programme, 259.
U.S. Explosion, Lessons, 295.
U.S. Explosives, 378.
U.S. Metal Mine Accidents, 234.
U.S. Mine Disaster, 53.
U.S. Mineral Products, 360.
U.S. Minerals Yearbook, 280.
U.S. Oil Products, 396.
U.S. Safety Cars, 136.
U.S. Ventilation Points, 212.
Underground Supports, 327.
Underground Transport, 78.
Under-manager's Duties, 252.
Units and Memoranda, 298.
Units, Electrical, 12.
Unusual Accidents, 18.
Uses of Scottish Coals, 122.
Utilisation of Coal, 283.
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