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46 (XLVI) — 1935-1936
U.S. Coal Cleaning, 105.
U.S. Coal Figures, 228.
U.S. Explosions, 72.
U.S. Explosives, 388.
U.S. Mineral Production, 57.
Underground Conveyors, 287.
Underground Curves, 414.
Underground Fires, 147, 317.
Underground Haulage Accidents, 82, 83.
Underground Levelling, 93.
Under-managers and Safety, 100.
Undetermined Strata, Behaviour, 70.
Use and Abuse of Explosives, 312.
Utah Blasting Practices, 72.
Utilisation Problems, Coal, 292.
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