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44 (XLIV) — 1933-1934
U.S. Mine Explosions, 35.
U.S. Mining Statistics, 51, 89.
U.S. Rock-dusted Mines, 4.
Underground and Surface Fires, 237.
Underground and Surface Surveys, 47.
Underground Colliery Canal, 59.
Underground Haulage Accidents, 45, 118, 138, 147.
Underground Officials, Lamps, 248.
Underground Transport Development, 390.
Underground Workers, Appeal, 387.
Under-managers (Colliery) of G.B., 312.
Unification, Mineral Ownership, 411.
Use of Fuel, Economical, 170.
Utilisation of Coal, 327.
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