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58 (LVIII) — 1947-1948
U.S., Coal-Gas Retorts, Production from, 293.
Underground Fires, 233, 247.
Underground Survey, 23.
Units in Electrical Calculations, 42.
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58 (LVIII) — 1947-1948U.S., Coal-Gas Retorts, Production from, 293. Underground Fires, 233, 247. Underground Survey, 23. Units in Electrical Calculations, 42. |
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