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51 (LI) — 1940-1941
War Levy Scheme, 203.
War Requirements, Mines and, 5, 40, 55, 87, 100, 101, 115, 134, 165, 179, 203, 210, 229, 232, 244, 248, 304, 309, 310, 329, 343, 373, 395.
Water Purification, 375.
Water Sprays, 113.
Water, Storage under, 241.
Water-gauge, 38, 121.
Weathering, Mineral Matter, 228.
Weisbach Triangulation, 200.
Welding in Mining, 154, 190.
Welfare, 10, 25, 53, 81, 168, 199, 204.
Whitehaven Colliery Explosion, 395, 402.
Winch, Handling Coal-cutter, 196.
Winding Regulations, 2.
Winding Rope Pointers, 74, 412.
Winding Speeds, Safe, 89.
Wire Ropes, Strength, 324.
Withdrawal of Workmen, 28.
Withdrawing Steel Arches, 396.
Wool Truck, Escaped in, 405.
Working Details, 334.
Working of Coal, 220.
Working Seams, Order, 30.
Working without Explosives, 173.
Working, Conditions Suitable, 397.
Working, Special Method, 301.
Workings, Laying Out, 208.
Workings, Old, 207.
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