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50 (L) — 1939-1940

War-time Colliery Organisation, 158.

War-time Lighting Restrictions, 90.

War-time Mine Supports, 260.

War-time Problems, 276.

War-time Welfare, 164.

Washery Water, Clarification, 281, 389.

Washing Coal, S.G., 193.

Water Tube Boilers, 110.

Water-bearing Strata, Sinking, 290.

Water-gauge, 220.

Wattless Current, 214.

Wear, Mechanism of, 325.

Welfare Fund, 24, 58, 69.

Wet Drilling in U.S., 341.

Wet Strata, Sinking, 390.

What's Right with Coal, 28.

Wheeler, Professor, 149.

Winding Engine Cylinders, 6, 399.

Winding from Intermediate Level, 268.

Winding Plant, Safety, 410.

Winding Rope, Size, 215.

Winding Ropes, 196, 324, 355.

Winding Ropes, Adjusting, 220.

Winding Water, 190.

Winding, Change-over to Electric, 406.

Wire Ropes, 106.

Withdrawing Supports, 225.

Worked Out Areas, Sealing, 234.

Working Methods, 162, 207, 310.

Working Places, Ventilation, 189.

World's Coal Output, 257.