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59 (LIX) — 1948-1949
U.S. Consumption of Explosives, 149.
Underclays, 197.
Underground Curve, Setting Out, 303.
Underground Extinguishers, 54.
Underground Fires, 14, 35.
Underground Haulage Track, 72, 204.
Underground Levelling, 220.
Underground Man-riding Trains, 78, 92, 100, 111.
Underground Road Survey, 114.
Underground Temperature, 141, 200.
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