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38 (XXXVIII) — 1927-1928

U.S. Coal, 69, 268, 299, 345, 379.

U.S. Coal Carbonisation, 10.

U.S. Electric Power, 248.

U.S. Experimental Mine, 299.

U.S. Fatalities, 10, 21, 245, 291, 395.

U.S. Mather Explosion, 363.

U.S. Mine Fires, 309.

U.S. Mining Conditions, 139, 321.

U.S. Output, 149, 160.

U.S. Rescue Contest, 89.

U.S. Safety Record, 234, 345.

U.S. Stone-dusting, 85.

Ultra-violet Ray Treatment, 39, 64, 165, 249.

Underground Dangers, Water, 86, 118.

Underground Haulage, 158, 331.

Underground Haulage Accidents, 178, 196.

Underground Minerals, Detecting, 249.

Underground Transport of Injured, 138.

Underground Transport of Workers, 167.

Underground Travelling Roads, 270.

Undersea Coal Mining, 42.

Unemployed Miners, 395.

Uranium Properties, 21.

Uses of Contour Maps, 130, 154, 164, 184.

Utilisation of Coal Supplies, 72.