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56 (LVI) — 1945-1946
Oil, Determining S.G. of Sample, 93.
Oilfields in Britain, 285.
Old Workings, Approaching, 10, 56, 149.
Opening and Layout of Seam, 11.
Ordnance Survey Maps, 246.
Origin of Bituminous, Cannel and Anthracite Coal, 250.
Outcrop Rocks, Breadth of, 10.
Outcrops, Effect of Faults on, 283.
Output, Coal, 54, 192, 228, 272.
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