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38 (XXXVIII) — 1927-1928
Occurrences, Reporting, 350.
Officials' Examinations, 406.
Oil Yields, Retort, 251.
Oil, Coal, in Diesel Engines, 385.
Oil-fields, Madagascar, 249.
Old Workings, Sinking Through, 208.
Ontario (1925) Report, 123.
Ontario, Alberta Coal for, 9.
Opening Lamps Belowground, 192.
Organisation, First Aid, 91, 109.
Orifice, Pressure Losses, 379.
Output, Coal, 27, 33, 56, 88, 97, 109, 115, 138, 151, 167, 184, 204, 217, 231, 251, 265, 288, 289, 303, 305, 331, 337, 379, 385.
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