Strength, fracture and workability of coal : a monograph on basic work on coal winning carried out by the Mining research establishment, National coal board
Strength, fracture and workability of coal : a monograph on basic work on coal winning carried out by the Mining research establishment, National coal board
Strength, fracture and workability of coal : a monograph on basic work on coal winning carried out by the Mining research establishment, National coal board / by Ivor Evans and C. D. Pomeroy
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