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48 (XLVIII) — 1937-1938
U.S. Explosives, 9.
U.S. Films, 341.
U.S. Gassy Mines, 55.
U.S. Lamps, 37.
U.S. Mechanised Mining, 91.
U.S. Oil from Coal, 359.
U.S. Safety Instruction, 33.
U.S. Ventilation Doors, 389.
Underfeed Stokers, 67.
Underground Fires, 122, 326.
Underground Haulage Accidents, 161, 186.
Underground Staff, 46.
Undermining Observations, 324.
Unworked Coal Area, 191.
Use of Canaries, 131.
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