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47 (XLVII) — 1936-1937
U.S. Accident Rates, 21, 373.
U.S. Coal Preparation, 245.
U.S. Coal Statistics, 40.
U.S. Explosions, 149.
U.S. Mine Lamps, 64.
Underground Cables, 60.
Underground Pumps, 271.
Underground Subsidence, 145.
Underground Transport, 381.
Under-managers' Commission Evidence, 164.
Under-managers on Accidents, 100.
Units, Electrical, 361.
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