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55 (LV) — 1944-1945
U.S. Coal Mission Report, 55.
U.S. New Research and Development Laboratory, 224.
U.S. Production of Coke and By-Products, 20.
Underground Fans, 186.
Use of Chocks, 146.
Use of Wetting Agents, 240.
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55 (LV) — 1944-1945U.S. Coal Mission Report, 55. U.S. New Research and Development Laboratory, 224. U.S. Production of Coke and By-Products, 20. Underground Fans, 186. Use of Chocks, 146. Use of Wetting Agents, 240. |
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