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53 (LIII) — 1942-1943B.T.U. Values of Coal, 5. Barnborough Pit, Shock Bump at, 8, 170, 186. Barnsley Main Explosion, 66. Blackdamp, 61, 93. Blasting, Cushion Methods, 243. Blasting, Efficiency of, 294. Boring, Methods of, 70. Boyle's Law, 138. Burns, Treatment, 52. |
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