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60 (LX) — 1949-1950Oil Fires, 111. Old Workings, Approaching, 188. Omitted Height, Problem of, 300. Outcrop, Tracing and Limit of, 26. Outer Rail on Curves, 110. Output, Coal, 1, 26, 38, 66, 86, 113, 128, 156, 201, 268, 293, 307. Overwinding, Prevention of, 238. Oxygen, 121. |
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