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45 (XLV) — 1934-1935
Obituary, 5, 71, 116, 275, 327, 341.
Object of Research, 322.
Occurrence, Gases in Coals, 297.
Officials, Colliery, and Safety, 363.
Oil from Coal, 53, 82, 91, 171, 184, 359.
Oil to Coal Conversions, 133, 165.
Old Workings, 335.
Old Workings, Safety Measures, 189.
Open Fire Advantages, 101.
Open Lights, 24.
Opening Out Longwall Face, 205.
Outbursts, Gaseous, 174.
Outcrops and Borehole, 180.
Outlet for Steam Coal, 245.
Output Reckoning, 132.
Output, Coal, 8, 19, 40, 57, 72, 81, 83, 105, 124, 139, 149, 167, 178, 203, 219, 235, 248, 262, 276, 295, 309, 325, 360, 380, 391.
Output, Regulation, 224.
Overtime in Mines, 1.
Overwind Prevention Report, 314, 324.
Overwinding Defined, 315.
Oxidation of Coal, 132.
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