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50 (L) — 1939-1940
Haulage Arrangements, 335.
Haulage Curves, 31.
Haulage Methods, 45, 129, 340.
Haulage Problems, 45, 53.
Haulage Rope, 365.
Haulage Ropes and Capels, 415.
Haulage, Endless Rope, 340, 360.
Health and Welfare, 146, 179.
Health Hazards, 101.
Heat, 62.
Heat-flow from Rock, 83.
Heating, Detection, 96, 118.
Helmet, 7.
Hook's Law, 87.
Hydraulic Stowing, 186.
Hydrogenation-Cracking of Tars, 140.
Hygrometers, 141, 186, 264, 280.
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